Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a531a7b48ec19d9…

MALICIOUS

PDF

68.2 KB Created: 2020-12-30 06:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 20388d0ea7b064ee37b403e56ab229b0 SHA-1: 7e9e8003c9dc9eba26b4b0366dfe586f80be4418 SHA-256: 6a531a7b48ec19d9d7b5daa192358a6a9b36371d43cd1aeaae0f8014e1cfdfba
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to potentially harmful sites. One of the external links points to 'https://s3.amazonaws.com/farowug/terer.pdf', which is likely part of this link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/123?utm_term=jane+addams+high+school+granada+hills PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5f965764546a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_5fba04febe68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5f9ec04db918d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/8570651.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/dharHsH/pinball_deluxe_apparatus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5fa01910dd55e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fc8f911380f4.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/R5WBZmR/photo_colour_change_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/6ihE6K5/install_trap_under_bathroom_sink.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/Zgfhfhh/car_price_calculator_olx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/terer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746763d1-db00-4b7b-bb7d-9c9eb75fd314/art_of_war_book_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18089754-e952-4dc5-8d5a-9f0547a29d31/winchester_1897_trench_gun_stock.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_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 5340 bytes
SHA-256: bfad96edda2e5c6dca67e23d7687cef986c58b10d1da631d9188f33e47b37433
font_01_sfnt_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 10180 bytes
SHA-256: aa8f42de674bdf6826831dfe885fbec85eaa1267792c588bbf2a6a685db11848

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