Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8a36bed4d999b0…

MALICIOUS

PDF

65.0 KB Created: 2021-02-15 02:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9aa581a23d763c986a5144c0d13c6c4d SHA-1: 88be8a2854aa58ab6bb3d953ff3ce7e426293538 SHA-256: 5a8a36bed4d999b0edb801c482d9706f495a3bbfd125707e99608a57a6ea1ff8
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://seumenha.ru/wix?keyword=trig+star+problem+local+contest+solutions PDF link annotation
    • https://cdn.sqhk.co/jasojime/gighjbS/supijasibujijafexabipup.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/0bcb04a4f.pdfIn PDF document text
    • http://helplnstagramoffice.com/239413806073b37w.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/6185177.pdfIn PDF document text
    • https://zenugewitewane.weebly.com/uploads/1/3/5/9/135960096/gasetobusefeb.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/axRggMf/kowejo.pdfIn PDF document text
    • http://eurofamily.pro/ios_injustice_hackhe3sn.pdfIn PDF document text
    • http://temilops.xyz/zixemuranogokezigozobuzosdsem4.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/ghjfdgd/voodoo_doll_magic_trick.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fce8c7807c34.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/gobalamajuvol_daguvugojari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483081/normal_5fe1547f29709.pdfIn PDF document text
    • https://benuzusovapa.weebly.com/uploads/1/3/1/3/131382148/lolekoj.pdfIn PDF document text
    • https://sasepanubur.weebly.com/uploads/1/3/4/6/134600976/2130149.pdfIn PDF document text
    • http://vkysnaya-eda.site/xibulefadww5e0.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/Cjejbhj/39453955923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_600109047e86d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcb657eb5778.pdfIn PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/koroxolaganazivul.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/babeloloke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F1 5340 bytes
SHA-256: 28f8a2f93bbc3558e100d0955b90b4ad76b1b7c06115e9d73e3aa5b354e4ca65
font_01_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 9884 bytes
SHA-256: d3fcf2c5165928d69eb41dd6fef5b3a40bd5453ed31120134b59cb0576cdc488

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