Malicious PDF — malware analysis report

Static analysis result for SHA-256 370e7e50114b462a…

MALICIOUS

PDF

94.3 KB Created: 2021-02-27 23:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6595244d00ffa43c57b5f03bd1abe93 SHA-1: 9a831b7166ac734bf92eb7209d36afb76d3aabda SHA-256: 370e7e50114b462a84c8d863229bb4e3d4963dc37128d7bee769a220ff792ece
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ponafet.ru/123?utm_term=what+are+the+key+elements+of+a+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426967/normal_602f6ff1a18b5.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/TgiigwT/zanizexepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6037680a37ab7.pdfIn PDF document text
    • http://magazinrf.xyz/song_hits_2020_tagaloggy3fb.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/xibovikowiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_6039261f2b4ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_600c1f04ef80e.pdfIn PDF document text
    • http://plsale.pro/hernia_inguinalis_medialisqzn49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_60153fe36ec9f.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/michigan_child_support_guidelines_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426966/normal_5fdec57893c4f.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/tezikuneraranefiverak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_60277ffe319c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470222/normal_5fda223156c14.pdfIn PDF document text
    • http://saudiautoinsurance.com/easy_video_cutter_for_android_phonei6ait.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/how_to_help_your_hair_grow_african_american.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_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 5320 bytes
SHA-256: 07f0c84027ee2eaa339d0a5421eb40d532886cada32fbe3280bf16d6649068ff
font_01_sfnt_off000146e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E5 10896 bytes
SHA-256: 5a1b3d28046af9616c8d65d30e58671c093e8d1f1ed593d8836d53c818063564

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