Malicious PDF — malware analysis report

Static analysis result for SHA-256 852164b4a942a256…

MALICIOUS

PDF

70.3 KB Created: 2021-03-12 15:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 52a5bb64c8bf43c5760966e933372532 SHA-1: da59933c31e6e541dcf9f42b4d2d47b657d893c6 SHA-256: 852164b4a942a256a78c92779dde5fb1fe92b57dcae42dd52b4ecfa0a581ecaf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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://nipisod.ru/award?keyword=numenera+bestiary+3+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368762/normal_600cf7750e06a.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/melobamesijizefidezomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_60302a330c604.pdfIn PDF document text
    • https://majuzifulanapu.weebly.com/uploads/1/3/4/8/134887757/tivuzat-xezojivuraji.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/4716815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60382f2fba5c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5fe3a7cd9833e.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/89443059250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_604463318daed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_601c5e7e5f93f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478932/normal_5feb348627be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_601de49b641f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_60083a03e2632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470543/normal_5fe4f6da92af0.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/how_much_is_hp_stream_11_in_nigeria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_eb06f8e84b0849bca37b1143ef7ad650.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/42136360145.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_10dbc7d154ee4b6db83dcbe1c59b0f90.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_760923d19c0848cb9792f27e236be4e5.pdf?index=trueIn 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_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 5532 bytes
SHA-256: d5d82edb7a1dfa7efc7c134d03bcffe80f5270408a6882115e4e6550c3fb218e
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10488 bytes
SHA-256: 1e3f45b8ac123c46d51979dadcb1681977befa38ebe37083145819623cb4931b

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