Malicious PDF — malware analysis report

Static analysis result for SHA-256 2baa035216628172…

MALICIOUS

PDF

70.1 KB Created: 2021-02-07 15:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3051277308b12fcb4b2d954678c31151 SHA-1: dd73ab007bdbd1178cf743c8ecbe57a4a100bd47 SHA-256: 2baa0352166281728dffa846a1a7667a10f7829bffb52a8a9bd9964a07a0ae1c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious websites. The embedded URLs and the PDF structure strongly indicate a phishing or SEO spam campaign.

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://seumenha.ru/wb?keyword=conditional%20sentences%20in%20reported%20speech%20exercises PDF link annotation
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/4802242.pdfIn PDF document text
    • http://tukameduk.22web.org/5640316031.pdfIn PDF document text
    • https://kesakoti.weebly.com/uploads/1/3/1/0/131070149/lifenagigol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5ff1bcc0857a3.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/d9edda1.pdfIn PDF document text
    • http://setovewurepenu.22web.org/85814562155.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/cde88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_5fda93da87bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fdc2682e622b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385850/normal_60032d1887e49.pdfIn PDF document text
    • https://fizexafotunuguv.weebly.com/uploads/1/3/1/0/131070009/2811823.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/megixuzomat_wosutepasimofag_sisepesok.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/9879679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxukesaludu.epizy.com/tej_i_love_you_ringtones_telugu.pdfIn PDF document text
    • http://jopiwutipav.epizy.com/50747164523.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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 5136 bytes
SHA-256: 3220581391446ccab93de73ae888e32f793ae0d085abd04c217c30d70670508f
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 14776 bytes
SHA-256: 559d29e22869a4e54d8c52329b656be1990c696ad257959dd5433c7267b96114

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