Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe7220ef96c44af…

MALICIOUS

PDF

80.9 KB Created: 2021-04-12 17:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 666dc7b57a3d5937d59632b2c4b6279e SHA-1: b0befb6f5d3fb3984b60a8a0fc1b076becce741e SHA-256: cfe7220ef96c44af2d9f1eceb83f3946341681db50d0963b3369e38dafc85876
186 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=maintenance+and+reliability+engineering+online+course PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501777/normal_6060072547c68.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/hfvhfqm/88399406678.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/idTigGw/kasef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5ff96fe72f274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373999/normal_5fdca93c17640.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/iehfibE/65395239346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_5fc9ec26677fc.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/cz6gdic/17305764164.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jjejg7e/jafepetibupegijuwawipari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_6041d75e26f21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_d5d5d11ed9714a5788615bcd56a7785f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09126c62-1dec-4a3c-8f9f-753ce3cc4c2f/netgear_wnr3500l_v2_openwrt.pdfIn PDF document text
    • http://bezofiwod.rf.gd/sabotixesekadanu.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_1bdcdfc7e245479db64e4a42fdb68e7c.pdf?index=trueIn PDF document text
    • http://muzubosumewuxem.epizy.com/63202544384.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_603660caec2a4870b456c1ffcd52f962.pdf?index=trueIn PDF document text
    • http://gavapesofu.epizy.com/kekafufubotovil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8122766e-e8e4-4b65-93d2-732ef46ca580/82514947826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29557401-00b5-40ab-8752-6691cb4e360c/84800157702.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_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 5352 bytes
SHA-256: 7b45d6b4989b00b301d9f850fe361a46fdd64de5e49049c8668268ef2e5a021e
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 11276 bytes
SHA-256: 212e8cae598edbae8e82e0998c788be4fc86416c02479b66a4623d3d19ea5138

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