Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73479a0fc259166…

MALICIOUS

PDF

69.2 KB Created: 2021-02-16 06:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 63923e07360cf802af8a7a1f8297c46c SHA-1: bbdbaacc22b0992485cfbe6e441c5a374886b7c2 SHA-256: b73479a0fc2591665fb69c727936513087c92da5cf5990ca3b444bc04d85742a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://seumenha.ru/wb?keyword=beats%20solo%203%20review%202020', appears to be a lure for users searching for product reviews. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's primary purpose is to redirect users to malicious or spammy websites.

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/wb?keyword=beats%20solo%203%20review%202020 PDF link annotation
    • http://joxutodotuwosej.22web.org/68671492679.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/b49e3fe64e.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/bobus-bibuwamolin.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/totagufoxem-vobifem-buvosezup.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/7217032.pdfIn PDF document text
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/4179561.pdfIn PDF document text
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/nidutimod-fomepijanow-jobowemufuju-tetozu.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/gQDjcaB/project_manager_jobs_linkedin_uk.pdfIn PDF document text
    • http://lorebip.22web.org/sitemap_template_free.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/4892446.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/jehbjen/slap_king_mod_apk_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/i9jc6jh/48950691979.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/mefovu/3731044740.pdfIn PDF document text
    • http://zisafaziga.epizy.com/air_supply_songs_free_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/52032760819.pdfIn PDF document text
    • http://misopipe.rf.gd/play_store_apk_gratis_game.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/59789315455.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_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 5316 bytes
SHA-256: cc97c59c31b194c2f66db537216cd5ad890ed32c6c9cb0e2886e722958f78f32
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 10524 bytes
SHA-256: 6beee9f5ae15fc09e8ee9891c57aa7dbc28cf9f88e23ba66f06c8056210648a2

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