Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ace4c15d70544a…

MALICIOUS

PDF

75.1 KB Created: 2021-01-30 07:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6248240b57a8adfbf39b8133ee4e43d1 SHA-1: 216dee820d662c8a75ad9c03c0d1564fec47961c SHA-256: b8ace4c15d70544a6e47f990adecd18187bce3927a9dea533409c84badb9998e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to 'The pink swastika' and the authoring application, which likely serves as a lure to direct users to the malicious URLs.

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://crophysi.ru/123?utm_term=the+pink+swastika PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450636/normal_601293a6a2608.pdfIn PDF document text
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/rumudalijerogakurido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_5fd8773025b19.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuxemop/bIKhbjf/3830589701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5ff5167fdc6f3.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/OnifPDN/xavazixera.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/7JheihR/smash_hit_unblocked_games.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/2258210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fccd04d02d4a.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/fupaweso_wokumoma.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/IVgc9cS/xibevadara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ffb8726363e3.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/nitatotol/livabozejexigazukajef.pdfIn PDF document text
    • http://gafomawonerif.rf.gd/pemagune.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/38382175232.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_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 4884 bytes
SHA-256: 54ba855c3b9dfaea618fc6f037ce9a6ff3e3dc5d8ef80735e547cc16d8f74c42
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 11384 bytes
SHA-256: ade771c3716cf51edbd6ddf4c36c6c45c35795ecaa9d149fc392f6f20c9eac2d

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