Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d2fc6d62dceef7…

MALICIOUS

PDF

80.2 KB Created: 2021-04-01 03:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ee17ab8a9eb8cb3478aba41ad4c89f98 SHA-1: 7395d42f811f84e5470060d9577d0f6f92c87232 SHA-256: a1d2fc6d62dceef79729237ea1d14098b8a011bdfc00033fd0c2db04c4448dcd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=political+parties+webquest+part+1+donkeys+and+elephants+answer+key In PDF document text
    • http://mamafiposorugul.sportsontheweb.net/pride_and_prejudice_chatsworth_house_filming_locations.pdfIn PDF document text
    • http://moitender.org/teboky3czi.pdfIn PDF document text
    • http://pushbiz.fun/refadqnz3y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_606249bbd1f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_60539f49df4cb.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/the_earth_chronicles_handbook_zecharia_sitchin.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/cell_phone_addiction_essay.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/4a4b4cbe-2666-4199-8065-44409456b3c4/tesowumoveluwulum.pdfIn PDF document text
    • http://pavafisufopu.myartsonline.com/54533065639.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/twisted_python_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995ba983-c7b6-467c-aeba-90620cf78980/xowalawod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b791d2-db1c-456d-b639-70adb59bfca7/what_is_the_wsj_prime_rate_today.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/la_la_land_planetarium_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/zitaj.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/what_is_the_book_daisy_miller_about.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/how_many_jacks_are_there_in_a_deck_of_52_cards.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/87688035863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1434e890-5259-4cf9-8d6a-5d3343b97668/what_plant_has_the_least_number_of_chromosomes.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/42631314836.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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 5740 bytes
SHA-256: 2555e01ea1ed757184e336f52170d2e5a3eb11de9d8a9980dff1d5e29562555f
font_01_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 10744 bytes
SHA-256: d6e67f6039a4f86d039303cfa5fac7d30bd34c93dec020c4d35309ae4c039a3a
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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