Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abca0f9580c21f7…

MALICIOUS

PDF

84.3 KB Created: 2021-05-19 22:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 12a34e7c94856398c90226260b7f161c SHA-1: 27a41c9c7b613f30fe085c4252dc1e0a69cbbe79 SHA-256: 0abca0f9580c21f732decfc3c50f90f39f92f29615c2ef4ca7ac9fe9b5cd324c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malicious content. The primary link directs to 'dafemum.ru', which is flagged as malicious. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=how+to+reset+a+kenmore+elite+front+load+washing+machine In PDF document text
    • https://kexeluki.weebly.com/uploads/1/3/4/6/134627649/bugufar.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/7870257.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/802370.pdfIn PDF document text
    • https://kororopimebopam.weebly.com/uploads/1/3/4/6/134645688/dagiwomapizib.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/wegewibuge.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/6953228.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/4347181.pdfIn PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/deaf90.pdfIn PDF document text
    • https://fikozipe.weebly.com/uploads/1/3/4/8/134887908/siropufizugog_rutap_daliwadetaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2882ad47-f635-4708-a2a7-00e3f711ac9b/four_rules_of_negative_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f03cd77-f54a-4bde-a68a-05042638e93a/fukiwesatimoxodima.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/what_are_the_different_types_of_database_system_users.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/best_10_android_phones_under_20000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1a97a2-fc73-489d-a3c9-3cdfedc8e337/hoover_steamvac_dual_v_carpet_cleaner_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d4aff9-7f0f-493c-b5a7-cc1d18a7a53f/focusrite_scarlett_solo_2nd_gen_buffer_size.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/71697688192.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/peer_gynt_morning_mood_violin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f83da39-3d57-4e30-bb34-16f2e90cc7bd/what_size_bike_do_i_get_my_toddler.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/new_york_times_covid_numbers_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/arm_compute_library_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef46c25-ff02-45e6-9a27-2092d592f1c6/66319391563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab41b328-8f6d-4a55-8994-47f8f00bd98f/class_10_physical_science_book_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/cod4_autohotkey_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5bded6-a066-4aed-92f2-eef4d3b04073/what_causes_backfire_in_carb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83db6e31-042e-4503-a450-8f3aaa084641/icom_718_am_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/rejuxo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 5552 bytes
SHA-256: fa27f35ab034d5841cc79b85bc54fbd964e5be49187f0b319532904a0661f49c
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10720 bytes
SHA-256: 0bc235ddef9ab8caba1074c9f7bed26b2e3bd998e71f0c33f363b0e6317fd9a9
font_02_sfnt_off00012d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D99 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1