Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c0f7211872c7a4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 07:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 87b3e3bfb5c08d9facddf01d17e6f6fc SHA-1: 40e1636eed1276ca8609c201e2261e81f491d80e SHA-256: a7c0f7211872c7a4237245a171f6ab7664ba9ea157728c2873e354fbedd63c44
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs likely serve as a distribution mechanism for further malicious content or phishing attempts.

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://soxebez.ru/award?keyword=complex+numbers+problems+and+solutions+pdf PDF link annotation
    • https://papafamibupa.weebly.com/uploads/1/3/0/7/130775965/2682068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490920/normal_5fce76e4d2b5b.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/watch_hunger_games_mockingjay_part_2_online_free.pdfIn PDF document text
    • https://tizomejina.weebly.com/uploads/1/3/3/9/133997236/naneguvajuw-rilumidakataxet.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/rukoma.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/muxejemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_60257cb6247e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_604cbbb2488c2.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/5500577.pdfIn PDF document text
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/fipizaxomanezat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6012df9ce75bb.pdfIn PDF document text
    • https://lafuworopiraw.weebly.com/uploads/1/3/4/3/134341657/balulabetikifus_jumotidujivoxa.pdfIn PDF document text
    • http://sifaritube.sportsontheweb.net/busujaladukewubad.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/tunipu_fomasitasifigex_tewoxujuxe.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/atomistique_smpc_s1.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5300 bytes
SHA-256: 00790241a2a6de856e9f89093bc73f777a13e54dab1ba2ecf1984f448a9f7c2b
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 11780 bytes
SHA-256: 271441a5fb0461b08d8fe5bdaeed106c5620652942cdd30ba37e1b381ade0682

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