Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfb32b11d99e2ce…

MALICIOUS

PDF

91.6 KB Created: 2021-02-16 13:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b2899160a9bb10b6ee5249725865be12 SHA-1: ab3b61b6c062e8d97c7f710af42d0f1e9db1e5a8 SHA-256: 4cfb32b11d99e2ce05db6f11cd262bfb3ae1d818517b44a73f7a6fb25ab7d954
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, consistent with a link farm or SEO spamming operation. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

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://leonvi.ru/strik?utm_term=isoniazid+davis+drug+guide+pdf PDF link annotation
    • http://rutekotugu.22web.org/hd_video_er_app_vidmate.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/felijekuranemu.pdfIn PDF document text
    • http://texewofe.22web.org/14522957722.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/6a73c8bfc46.pdfIn PDF document text
    • http://mevilesiroxivo.iblogger.org/39203260389.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/nujizot.pdfIn PDF document text
    • http://callup.today/old_macdonald_had_a_farm_songgu7n1.pdfIn PDF document text
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/nanopo_difaxozozav_wobim.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/jobopetuvi.pdfIn PDF document text
    • http://segwaywheelchair.ru/27150834657a0z44.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/jedaxopopuko/13878307305.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/96142027858.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/pre_k_fine_motor_skills_worksheets.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/fiwojo.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_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 5224 bytes
SHA-256: a7ba5353e9d4db890de65660293b4b3cc998a6a648bdcfa6efe179657ac56667
font_01_sfnt_off00013823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13823 11984 bytes
SHA-256: f9d2a95aaf5952726bd71c21e92b433d79c1f68d389ef3cdbc2a5899c893ebc1

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