Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cad1c1e60a7804f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 20:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fb8482707a28b64a233b5ba0984eb63a SHA-1: 8689eb909ea161079b4258da7eb6e8afda4502ea SHA-256: 3cad1c1e60a7804f1bc4ad44e1ff9c7b4b71ba318194c2266182a3e7063c2359
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/strik?utm_term=can+you+convert+dvi+to+hdmi PDF link annotation
    • http://dexemipewuga.22web.org/points_lines_and_planes_worksheet_answer_key_a2-1.pdfIn PDF document text
    • https://nofoxevejumumu.weebly.com/uploads/1/3/1/8/131857054/1635477.pdfIn PDF document text
    • http://rarurude.22web.org/beautiful_s_letter_hd_images.pdfIn PDF document text
    • https://penosemoboz.weebly.com/uploads/1/3/2/3/132302809/nisirax-rasitafuso.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/6dbb1b140aba7b0.pdfIn PDF document text
    • http://merishwheelrecords.com/30888391588lvyjc.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/02ad7.pdfIn PDF document text
    • http://stickerrus.ru/curling_iron_reviews_consumer_reportso7t46.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/eca49d9a-220d-4d1b-a907-75388933e663/wildgame_innovations_terra_extreme_14mp_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef014e9-c6c3-42c6-a954-2a8a7398805d/how_to_run_a_grief_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797b7818-b5ee-4e7c-90f7-a8f10f3cfdfb/27338903521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b644fd-e1f0-478a-9251-75a32934681a/garrett_hardin_tragedy_of_the_commons.pdfIn PDF document text
    • http://migisunutejelu.rf.gd/tugojadev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb82817c-6ab0-4614-9716-05836dc689dd/are_amana_air_conditioning_units_good.pdfIn PDF document text
    • http://xodenumaverap.epizy.com/learning_how_to_learn_oakley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e18caed-041b-4c78-8a42-81b9f2c3127d/we_learn_nothing_tim_kreider.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5cbf47-ecc0-4820-bdec-e3048d962ad1/sony_str_dh750.pdfIn PDF document text
    • http://kujofumuv.rf.gd/master_plan_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28dd7a4-e248-4a05-a376-8c0022d3e0a0/whats_an_example_of_allusion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40521a38-4fef-444b-a70b-86abfa7f311d/quran_in_hindi_book_online_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b87b77-5482-4c55-bcc8-8afdecbab02f/ps4_controller_keeps_blinking_and_wont_connect.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 5036 bytes
SHA-256: dbb6ea5cf9b148825fb2e34d503570780a744224ecb2a724b1e742a6c66ace90
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 14260 bytes
SHA-256: 7ea0f8d3b9d4f6f0e15e743475531ea74001611720f72c643fe620e2a71b6547