Malicious PDF — malware analysis report

Static analysis result for SHA-256 5265312f068bc7ea…

MALICIOUS

PDF

75.6 KB Created: 2021-02-20 12:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5dcb44beb08bf8324cd8c200ebddac04 SHA-1: ec4aa39664e061d043b48f132b89fc03342dde7b SHA-256: 5265312f068bc7ea1b5b0387e7f672670ea0427fe5d342d967395f24498e87c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/strik?utm_term=baby+babble+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601dda33c5bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_6003c43d3c3e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481825/normal_5ff1163d6ec85.pdfIn PDF document text
    • http://medtechnika1.ru/action_linking_and_helping_verbs_quizz3dmr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_6016d77df0ac3.pdfIn PDF document text
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/kupijigelezi-sudazevanam-tajabit-fajegikape.pdfIn PDF document text
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/8396742.pdfIn PDF document text
    • https://kofulunaj.weebly.com/uploads/1/3/5/3/135320514/jovaz.pdfIn PDF document text
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/zutotukujepaboz-sipetoboz-xonitavexesosez.pdfIn PDF document text
    • http://wiinorama.space/wolekifurabudejuzug8boh4.pdfIn PDF document text
    • https://zinobelusetepi.weebly.com/uploads/1/3/5/3/135318062/55cf514db86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugesiv.epizy.com/curso_progressivo_de_violo.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/26509998675.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/vectors_equations_of_lines_and_planes.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/36897233937.pdfIn PDF document text
    • http://tawatibajat.rf.gd/sesinelumipexetexuvudilu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 5060 bytes
SHA-256: 10e0b5a1047839455070e38bb3a4df58e1152aa5cf1ef67f330a182f32694500
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 11044 bytes
SHA-256: 441a7a6add4a9506bac7dca6fe6ed5cb2755fb05e809600ed7bf161548224b90
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16304 bytes
SHA-256: fef793e49b4c758eda42f25c145c5e14322eb793e0491099f33d605b2aefd461

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