Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fef65aa6cddc2b7…

MALICIOUS

PDF

72.7 KB Created: 2021-01-13 20:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dbdacf981896693c5368a6a6227f1193 SHA-1: a2d88d6b33711fc94ee5ae63cdc38371f2ccf6b8 SHA-256: 9fef65aa6cddc2b79d4cfaa1d1a8f74057abb1c8ffd11e498cefab0898814fa8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary embedded URL points to a site offering game cheats, indicating a lure for potentially unwanted or malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffnew.ru/wb?keyword=download%20cheat%20game%20zombie%20diary%202%20mod%20apk PDF link annotation
    • https://futivodefumir.weebly.com/uploads/1/3/4/8/134861147/duwefofax.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/zepilusobexuluzapafe.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/de93c538.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/gipusapo.pdfIn PDF document text
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/9984732.pdfIn PDF document text
    • https://site-1179256.mozfiles.com/files/1179256/sheet_metal_folding_machine_for_sale.pdfIn PDF document text
    • https://gibonubud.weebly.com/uploads/1/3/4/8/134877094/lutubatisexifokimon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f982eb38a64b.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/5ba440c8d59.pdfIn PDF document text
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/fb3cd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5fa8e0e2d501c.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/3694699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 5888 bytes
SHA-256: c184fa3044f4d77b593ffa439decafab03cfdfea31dd4bc06934cd68fbab3774
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 10652 bytes
SHA-256: 8f18a350be2bd4a64fdb2e54268bd726dff018023db809b1ad7b6afe3ddfb236

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