Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7fb39c878a02eb…

MALICIOUS

PDF

65.4 KB Created: 2020-12-20 18:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 631308cf661c02464171a77799a4f64a SHA-1: b862ec9524c95de54a44111b8124baf84106ef78 SHA-256: cb7fb39c878a02ebfe1864254c9f86e9f96459db5b335e091a3e15d2aaaf23f6
206 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 by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. One prominent URL, 'https://trafffe.ru/strik?utm_term=envision+math+2.0', is embedded in the document, indicating a likely phishing lure. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=envision+math+2.0 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fcc1d889cb4a.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/cfa92dd97.pdfIn PDF document text
    • https://pagelenabiruzet.weebly.com/uploads/1/3/4/4/134462778/molikevowafeluve.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/1092797.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/berixa.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/8924004.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/2941632.pdfIn PDF document text
    • https://kutolimog.weebly.com/uploads/1/3/4/4/134435461/befedowagope-lelixipajij-nawedug.pdfIn PDF document text
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/tetarutijakuw-rojet-vosojuguxokas-disedukopi.pdfIn PDF document text
    • https://nibadaxolakawub.weebly.com/uploads/1/3/4/8/134882114/xijixiratelibojat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinabisura/33827823065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09ca712-8590-497a-82f5-aa06c573d9a3/how_to_hack_egg_inc_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/50_by_50_times_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d2b354-583e-40c5-a2f6-8e174224ec32/72913297581.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_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 5120 bytes
SHA-256: 94b7cdb52c47c9d98da6329c2ae2e3b91365c9d31e175af7af2047514622c75c
font_01_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 11424 bytes
SHA-256: 301bcaf5ac854348de8fa0500aa9c4691c30dc1116608eb8502775193327d610

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