Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cb3e45a33debe1…

MALICIOUS

PDF

80.1 KB Created: 2021-04-01 05:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4bb207d182a478c9deab9cb404f50e7f SHA-1: 15c955486bab1b9b23369b0c4e5d77cff7b8f569 SHA-256: a1cb3e45a33debe17bb1cda98ce23b3eabec2a37b75555f7af49e3fd78dc747f
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=oxford+handbook+of+clinical+pharmacy+pdf+free PDF link annotation
    • http://bokovajet.22web.org/mobosuguxap.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/large_pumpkin_iced_coffee_dunkin_donuts_calories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5feb1d870bf09.pdfIn PDF document text
    • https://kafunuxuvivupar.weebly.com/uploads/1/3/5/3/135303333/656913.pdfIn PDF document text
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/jojidenitavu.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/business_model_generation_by_alexander_osterwalder_and_yves_pigneur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_605b666808cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_60517f12c8e52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_601a011ed0f84.pdfIn PDF document text
    • http://marketitaly.info/5777324949out0.pdfIn PDF document text
    • http://meetsalle.xyz/depax7zg8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_6012ee4888ef8.pdfIn PDF document text
    • http://cardioactiveitalia.site/pewilunifegegamuderutkj5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_6019dd8dc5232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_604a921352b1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufuwajasuge.rf.gd/66923378605.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/93905761872.pdfIn PDF document text
    • http://fuxexuzif.rf.gd/49026373067.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_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 5616 bytes
SHA-256: 5c75a9aa6c5ebc7c78331dea8830a2754dd260ea61fe4a27f7944f7aff8ed95f
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 11240 bytes
SHA-256: 0d567a4e03aed55bf2036e8634da663b57aa8cd7ff18db63b151581fa4076995

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