Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c5a536adb1aea…

MALICIOUS

PDF

67.8 KB Created: 2020-12-16 21:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3dc4837cb38d94aadf6b336d0c570dc6 SHA-1: cadcc77ca92df7197650033a36e176c4a0081462 SHA-256: a76c5a536adb1aea786277284451fe397d8ea1adee8ea2c30e73fd15acffd554
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one prominent link pointing to 'trafffe.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://trafffe.ru/123?utm_term=gestor+de+arranque+windows+server+2012 PDF link annotation
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/juvokulolar.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/4027329.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/kokiwesopor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce0851c6682d375c8cd6c4/t/5fd614d3de5b1220c021cb8f/1607865555230/28550896389.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7904a778af068263f36d1/t/5fd65734d654060362c603a4/1607882549390/81296510535.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc537ff085bf90c0e196c76/t/5fd740c2de5b1220c0460ac0/1607942341149/takasenakosilolipisilusi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcee64e94f25741fd49f96d/t/5fd0c400a94600575885cd51/1607517187721/sonic_boom_tv_show_all_episodes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf0cc4a55824081a4c1f9/t/5fcfb97dcd9a2056ff848f30/1607448958025/shark_attack_wild_simulator.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529d86609fd0ee7ad3c2c/t/5fc96a29cc00d445e100c6ac/1607035435185/monkey_ropes_unblocked.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54630e9fc3622d53ece95/t/5fd6b355ab1a676c729b1f8e/1607906133625/45272986794.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc566a4c89e1c4b8fdcc8ea/t/5fd0391251357b44bb89ea18/1607481621357/ear_wax_clinic_locations.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e60b24b06a7eb3ff207b/t/5fc10e26e18c5c478e211b24/1606487599846/bomebafaba.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc140152cf09257bd6e62db/t/5fc5d5ece18c5c478ec591ba/1606800877202/jazekisepatamuno.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_off0000cc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 5424 bytes
SHA-256: a6095cf40e853f50f9d1032508d93cc064f00e2750d8e2d82a9226b58f554bf3
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10276 bytes
SHA-256: 7d0624942d9ffc118d90f5c52254813b80f4b23f29fef7f09accad5536d93f13

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