Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fb520e125a4a12…

MALICIOUS

PDF

61.3 KB Created: 2021-02-20 00:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ae7c1a32a5b47cafd982c6e12898d65 SHA-1: b68c0451d94df39b57a379c37dc764299b19baf6 SHA-256: 51fb520e125a4a123a064394b0202a4f1731fe809ff378bffaefcc0f2bb7bc2c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or SEO spam campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=golden+liteway+scooter+manual PDF link annotation
    • https://cdn.sqhk.co/ruvonusebex/mjiwbhh/88746536060.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/chgCFHm/castle_miner_z_xbox_360_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/khfgd4c/kajotuti.pdfIn PDF document text
    • http://theharaka.online/nezuxoregabodisatugilepbr2s.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/ftjbZia/bounce_back_lyrics_little_mix_az.pdfIn PDF document text
    • http://sberin.xyz/2356302499027ele.pdfIn PDF document text
    • http://italy-small.space/lifesipotakinivurofeq2bsa.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/cIhzut0/xevikapakurogavusamiwes.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/3hgxiJ5/73345464486.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/gonowamigisus.pdfIn PDF document text
    • http://yblda.fun/2pac_california_love_clean_version_lyricsd1gep.pdfIn PDF document text
    • http://sexedate69.site/burket_s_oral_medicine2gmkc.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/wupifejunovumebade.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ogejfie/seduxijotoraben.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopagit.rf.gd/kudadeberimirokufefezera.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_off0000b357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB357 5308 bytes
SHA-256: e4a5b1c52f8b0029465fba7d6f1f003dee1bf3073ed7d6daaeab6b31c27d6622
font_01_sfnt_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 10208 bytes
SHA-256: 06329e142fe37f6792155fe7d5491c16fbc62ed2272891fdea70c386c622122b

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