Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f04b5386443beaa…

MALICIOUS

PDF

65.3 KB Created: 2020-12-20 07:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4752201e3a949a07524da02f5062952c SHA-1: ef9a7df311bb0a1c8e0bff9218933aa21588a648 SHA-256: 5f04b5386443beaaf4379a4a1256ffd26467888f13d9c6f7e5608ca3f58eb309
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK, indicating it is part of a link farm designed for SEO manipulation and phishing. The ML classifier and ClamAV also identified it as malicious. The primary malicious URL identified is traffnew.ru, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?utm_term=ucsb+ap+credit+engineering PDF link annotation
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/6039022.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/9168029.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/6c5197ba-6271-4fe1-b8c2-a2f2ee3e7d1e/45101206773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8247b096-980d-44db-80f1-33350927db1d/best_driving_shoes_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75070bdd-82ba-4f6f-baa5-341bf12f2837/76777201794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88310a1-33fd-461e-87a5-ca868d89faee/89100340947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abba892-7743-4193-be33-ea50568fc047/mexitujumetapukejoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/venice_skills_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d1a53a-c70f-461d-bfed-2d433420f7aa/34412840580.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/bupejulolagoxifisedaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d398274b-62ad-44ab-b95c-fa14c3b3b66f/diwugokosujopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe58094-498a-48ae-a2f3-67812086d050/1_night_in_paris_rick_salomon.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/catchphrase_answers_level_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37557f01-ab04-4ee3-b81b-cc1ee4f900fb/lixapanutukel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08ff706-8b8d-4b0c-9b9d-d13175fdb659/duramax_diesel_colorado.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 5340 bytes
SHA-256: 71f88d3f163d122fa03f44899abcaea6fc52017ffc7502e5bf6affde992ff9a8
font_01_sfnt_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 10112 bytes
SHA-256: f8800884a4e684c9985c32033786ddd54d680c1a6b084a7cf81f3f935922d7e8

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