Malicious PDF — malware analysis report

Static analysis result for SHA-256 304a73aeb5672198…

MALICIOUS

PDF

75.6 KB Created: 2021-02-26 14:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 598cc1b1a1408d7c49f486b7953f411c SHA-1: 3f8d3b0e5a67b8dba6cea3a63b0959f8bf408ae4 SHA-256: 304a73aeb567219826a52e3973bbc287b522da80b8eaf02a1a0d1d93104ba13a
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://botokaw.ru/strik?utm_term=the+danger+of+a+single+story+gcse+summary PDF link annotation
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/e17b520d.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/zhchh8Y/vekamavariw.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/wiwapojodeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_60137d3979732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485587/normal_5fce9ba3bf42c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5fdff1d49a27e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_602c9df902501.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/2rCgjgj/choice_of_magics_apk_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_600c4a248ddf0.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/IheggRi/dreamcast_emulator_redream_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_6018cc1acd26f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60295f313786a.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/raxib.pdfIn PDF document text
    • https://rawunawikurek.weebly.com/uploads/1/3/5/9/135967659/af7f92c.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/V6dYMno/vibefat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_6007d4a7b81cd.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/8b716442.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/kiguteperilodu/understanding_chakras.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/wudoxotutedojekutep.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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 5484 bytes
SHA-256: c02cde172c2b9c6b8d8423a7550fc351189102e3ea53dcefe2c6ae4403255fbd
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 11044 bytes
SHA-256: 6bd3859e15238628401d8557e5a02464f6f32aa5a1073d195379ec3394760eb8

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