Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3fdab443d88624…

MALICIOUS

PDF

69.3 KB Created: 2021-02-18 16:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9a07df0e9e425cc46ad1120aa56dbb42 SHA-1: e343aa013db156861efec9d0e3567b9d13f918cc SHA-256: ac3fdab443d88624b11d62909019689d26a30853651b5c1cc50dcb554b90f86b
156 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 5

  • 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.
  • 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=present+continuous+exercises+for+adults+pdf+questions PDF link annotation
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/bikejipururepulezir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fdd36fe9ad64.pdfIn PDF document text
    • https://salizobujexi.weebly.com/uploads/1/3/5/3/135325558/towaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_5fe11d1434903.pdfIn PDF document text
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/8075928.pdfIn PDF document text
    • https://vefibaxo.weebly.com/uploads/1/3/1/3/131379874/puvavoxikuzafo-gibigupawejetog-kexijib-dolewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_60264dddb2fd4.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/2160376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_5ff8949767ac8.pdfIn PDF document text
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/fasijuf_jidopuluberuvab_vaxafamupo_kitujeluguje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulozor/24118706286.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/82139395759.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/soduv.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/android_opencv_set_fps.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/67893171118.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/fafaponifemexikuwovut.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/duxurasudawilirolexif.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/aristo-_tec_metal_forms_inc.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

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_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 5224 bytes
SHA-256: 7255c0bd414d10ba571fe368ffe2da7058a6c01f32bdb5ef8300615372e2eb85
font_01_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 9844 bytes
SHA-256: 9f4300f913426b2645278dee8a800dea16e31d21bf13e2da265e935632fcc981
font_02_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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