Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e1d3b8c1c74d3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 12:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ebbbfb28c585302de3ee0c037ac42c9 SHA-1: 0199e6ffdf2fb7a5b583f8554cde0184e8f81197 SHA-256: 284e1d3b8c1c74d38844ff8d96398d81fadfeae00e38e1353e13f07acb0955c9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful websites, likely for phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=equipments+used+in+microbiology+laboratory+pdf
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/a4454d48d750b7.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/gipiwolokazojitejono.pdf
    • https://static.s123-cdn-static.com/uploads/4405639/normal_5ff5d9cae5de8.pdf
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fca2f7c74d12.pdf
    • http://fuwijumazawad.mywebcommunity.org/calgary_lrt_map.pdf
    • https://cdn.sqhk.co/virurewev/4LjgXjh/51317194677.pdf
    • https://cdn.sqhk.co/duxadikoti/tBfsvhi/tinivi.pdf
    • https://cdn.sqhk.co/gopuxipo/eggckgd/fonuditojogugujawusifesuv.pdf
    • https://cdn.sqhk.co/reriwoduriju/haja5gi/witozosu.pdf
    • https://cdn.sqhk.co/tejurorado/ifdihGr/65267446706.pdf
    • https://junowebabozem.weebly.com/uploads/1/3/5/9/135965754/gigug-turofofaxiramo-tefoxudejefa-dobide.pdf
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/c15eb5b5f4.pdf
    • https://munijames.weebly.com/uploads/1/3/2/8/132814228/jazejekinosok-doxusufozuja-bugudewaxigaje-laboseki.pdf
    • https://cdn-cms.f-static.net/uploads/4375199/normal_601856a940890.pdf
    • http://dibosezufo.getenjoyment.net/alice_miller.pdf
    • https://cdn-cms.f-static.net/uploads/4463529/normal_6015147d0a843.pdf
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6001ce525728b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a4c0c98-cf2a-4fe1-a0b3-700e30fb66dc/is_sports_illustrated_weekly_or_monthly.pdf
    • https://uploads.strikinglycdn.com/files/b71c7d58-cbfd-4284-abfc-238ca7f8ad04/89246208242.pdf
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_2d5e4ba304554905a6109b60da528a5f.pdf?index=true
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_9eb08cdca738425aa5fd55c17c1d9c5b.pdf?index=true
    • 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_off0001045a.bin
b99a9615dd8214de45f5f55d1d50b1482d2b96a89c30febc65fe55f854b5fc4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 5800 bytes
font_01_sfnt_off0001180c.bin
c438f9ccf96ce62b31d7a5d27fb43d645d58705e0646aba5dfec3e47518a670a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 11256 bytes

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