Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c044bb07c20fbc…

MALICIOUS

PDF

73.2 KB Created: 2021-03-01 04:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 466eed451ebc804938c12c946b850fb1 SHA-1: 71eeacc63a1d44f576f76f4e052993eb064b5a7c SHA-256: b3c044bb07c20fbc34d767b7d5b61984d8ddd3b46fc6763257f9cfbf67ebe125
246 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. It uses brand-impersonation credential phishing. 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/1870488.pdf.
  • 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://lozipotod.ru/123?utm_term=super+mario+land+2+dx+emulator PDF link annotation
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/1870488.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/407434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_6015d74756e85.pdfIn PDF document text
    • http://nusururak.22web.org/sifom.pdfIn PDF document text
    • http://damita.fun/sharp_aquos_zero_price_in_pakistan_whatmobile36njs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5fcda6c112b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_6039c4a7da24b.pdfIn PDF document text
    • http://vemololuwejab.iblogger.org/16159177555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479212/normal_60327facdae6b.pdfIn PDF document text
    • http://pearhaidhr.fun/fender_mustang_1_v2_presets_downloadli1sp.pdfIn PDF document text
    • https://jesiwiluvilad.weebly.com/uploads/1/3/1/8/131857580/8164685.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/3b31e.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/141444.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/vabemavuputenif/going_to_worksheets.pdfIn PDF document text
    • http://botasalipigu.epizy.com/world_time_zones_worksheet_answers.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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 5232 bytes
SHA-256: b202da89fce480de4aab9c6816b12fbc1aff4eefe64016cb38fbc3dfc1db615f
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 11584 bytes
SHA-256: cf95fbcad6dee94582b98e130f0a7aaf49eef6ee0e1e11d3a8e1f3a734b56777

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