Malicious PDF — malware analysis report

Static analysis result for SHA-256 3855b5ebb04bfc04…

MALICIOUS

PDF

66.1 KB Created: 2021-05-29 00:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 006be554a747f7a98441af9cd2388c34 SHA-1: 41538ff5d993d588fc0b2b4e31dbd08b99e0046e SHA-256: 3855b5ebb04bfc04ec55b30b1d177a093edd4a939f548c9d690206dfb7ddf85f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/123?utm_term=seek+and+destroy+ps2+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5fc8741eb8af0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ff6837a1a709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_60515409aba67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fd06bced896c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_600b47d887748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_604f49d588004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_604cbb37df92a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4449777/normal_60aff7af63519.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/kakozobigi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4496153/normal_60b1296191c07.pdfIn PDF document text
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/jujari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_602f33ef1ef6c.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/656366df-b900-4ebb-95c8-48c047ff2364/kumifuvepilalizuzonapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6637e2-1026-4a79-bee5-860c4211031f/wedudegisonegaliforok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f49003-2ba1-4b9f-92d5-ea4374d2f009/tazuwenudumesuwojedazadiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d2b401-01d5-404d-a6ee-ba16266ae44c/zojirushi_bread_machine_manual_bb-hac10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75b9b8d-a5be-4932-95a8-5ed6ed6430b6/best_graphic_design_app_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b164f7-8c8b-4f83-8d14-b135e3f2b2b4/27440849270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5fd3e6-51ce-4d7b-81da-a0c03a6b3c50/tivo_premiere_4_model_number.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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 5648 bytes
SHA-256: a8de38318f075668e7f405d5564724b44eee1c8dbceff3835435f497e97cdcdc
font_01_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 10376 bytes
SHA-256: 5091ee1cd90c26bd7550894aba9ee60b4860a457c8a9c61016484f8927f029ba

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