Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b55b82b639a2b47…

MALICIOUS

PDF

84.1 KB Created: 2021-03-16 13:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2e950010ad45cfe877606ee81e994b SHA-1: 3169d2e4abe4b69c2fa8dc6eadd4711e2412000a SHA-256: 7b55b82b639a2b47873badcffc2a84ed82ab5cfa665e43ddbc9f3e80a90a6981
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=define+habitat+and+ecological+niche
    • https://cdn.sqhk.co/sitopizol/cQhhjic/between_the_lions_the_happy_hocky_family.pdf
    • https://cdn-cms.f-static.net/uploads/4460232/normal_601b1a781124f.pdf
    • https://cdn.sqhk.co/pegidago/HjaYEji/bikemawovetawuniropowifik.pdf
    • https://cdn.sqhk.co/fiseguvugele/4jojg5n/82068475215.pdf
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/vimop.pdf
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/pojuzuru.pdf
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6041e711d4047.pdf
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5fc816769f6c7.pdf
    • http://latencfsrt.space/111654881872jskl.pdf
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/6790cde3da.pdf
    • https://zowuxebikazusi.weebly.com/uploads/1/3/4/6/134654267/boxurutapugo.pdf
    • http://discount50it.pro/30849554341vxm1o.pdf
    • https://cdn.sqhk.co/demanajinu/nqghje4/78631779555.pdf
    • https://cdn-cms.f-static.net/uploads/4446015/normal_601503d7bacb7.pdf
    • http://4escam-bot.online/free_template_christmas_invitationskgcty.pdf
    • https://cdn.sqhk.co/rekubapapup/PMjaiak/zawawalixizar.pdf
    • http://retys.space/happy_birthday_song_youtubexe3gp.pdf
    • https://cdn.sqhk.co/dedizajo/xalDhha/96240492923.pdf
    • http://pogadai.xyz/24557723822j3iuz.pdf
    • https://static.s123-cdn-static.com/uploads/4420924/normal_6001ece290760.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tojulov.epizy.com/insolvency_and_bankruptcy_code_act.pdf
    • http://bubexixan.epizy.com/boogeyman_3_2008.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ada.bin
34a168a2ee5c4682da2d0d8b9236501725f2bd63ecbc9a73b2f2313f67ea4f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 5148 bytes
font_01_sfnt_off00011c67.bin
0e665e86d65a9b6e0bb8cee1c9c1e1f0cde1675617c2a2aab12d0ecfaa989109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 11144 bytes

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