Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f80d869a2f4110d…

MALICIOUS

PDF

72.8 KB Created: 2021-01-06 07:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6f0ea83754c8ec45ef17883a07b74790 SHA-1: 3e2e23e8e42bde5e7b3c950312992fd63edccdff SHA-256: 7f80d869a2f4110d544c3d21c364bc59706dcc27471af78919cff73e359f9361
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one notable URL pointing to 'trafficel.ru'. The presence of a PDF link farm heuristic suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/aws?utm_term=used+cars+not+to+buy+consumer+reports PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383444/normal_5fc030f4eb3a7.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/57171.pdfIn PDF document text
    • https://cdn.sqhk.co/xomifinetepi/HhihijG/gesikewipofuru.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/yhg60jf/dowuvexusezani.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/ieulgg8/little_mermaid_wallpaper_hd.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/0c543822-8bb7-431d-a263-b4d790f5c34a/sound_level_meter_software_and_calibrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5004bc6-e6db-45bd-bd8a-59dff6e4fca8/sebesagasurusijirirumawov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42da6e74-2cf9-4e90-808c-36d12e337125/63586869157.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/35195164224.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/idrivesafely_quiz_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b538db-3f78-4ed6-a447-9c7ac88f4af8/13800479775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6624a837-4315-46f4-afbf-dd37fdd6bde9/malaysian_trumpet_snail_babies.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/62157596180.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 5420 bytes
SHA-256: 0a426e8251a519265986aae7e925d1adf6743ecc26ae54117766377dc3fb192e
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10700 bytes
SHA-256: 99b4697ffff5821eb903fed3c1a5be87b6c2a6e5b5add21641fb9e740ab93ac8

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