Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e018e6f88dbb77f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-15 05:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4109105294a6ceb7910b01240d5720ce SHA-1: a404098f87f11b5478e23c35b46e94338e6c7183 SHA-256: 8e018e6f88dbb77f010d59bfee5c9f96123171b3bea1da8321c4f1fecdef83b6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to drive traffic. The presence of a URL with a 'bank exam' query suggests a phishing or scam attempt to lure users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/strik?utm_term=bank+exam+reasoning+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/lijusute/IhiXid6/gorilla_diet_protein.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jxOhage/modern_warfare_maps_season_6.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/jawedukekoranizo.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/doxobuvetatuku-biperobeg.pdfIn PDF document text
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/paliwurutu.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/5gejiih/zerekolop.pdfIn PDF document text
    • http://beremoter.online/how_to_determine_if_compound_is_ionic_or_covalentsp8ea.pdfIn PDF document text
    • http://fullcreditreport.info/fezorikkq5zb.pdfIn PDF document text
    • http://perevod-card2card24.site/s_letter_heart_imageswjqx1.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/Ngjgj6k/73931791679.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/IcghUnj/51645579357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_52b6c237d8d04d7eaae45205930b9068.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_faab6835c7be438287c826e5b5cf2977.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_bc23b541646f46f0919dcad22bf38791.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_a873c9d3b8714174ba9164fbae820131.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/ragimuxajovuwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/44655199914.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_1c8823a6a9ee414ebae17cb825df3959.pdf?index=trueIn 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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5728 bytes
SHA-256: 97029cf2ebeb7ace6aeadcb1c921641f5157f38b75071f3605442c1183bbd47c
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10784 bytes
SHA-256: ed2ed6f2aa9f133385a57e68c3c4fee62e0fa8f58c1514b3d19396a575539aea

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