Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04a0b65632fd078…

MALICIOUS

PDF

77.5 KB Created: 2021-04-18 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be92dc3b0b3c71009a23bfefb329251c SHA-1: dff0d4a5090ee20841ec4ed94174ede7c49a3370 SHA-256: f04a0b65632fd07802df59fcc22d9fa1bfed390dd5d45c8bf53ef950b344eb7f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=g+shock+ga+110+battery+replacement PDF link annotation
    • http://afracheat7.xyz/damizimegazdllw2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_606a622a9a1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_606e9fa0ea212.pdfIn PDF document text
    • http://cheapestshop.xyz/468914633196lr1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_60470313612a3.pdfIn PDF document text
    • http://osmosiotzs.fun/fuvoditifigevq208r.pdfIn PDF document text
    • http://agreevudb.rest/the_amazing_claw_machine_as_seen_on_tvmsyas.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/jupoti/sony_str-dh790_best_price.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/business_action_plan_template.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_e5e30ae9253944f6b71f5f17fc0d07a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/99663047551.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/que_es_el_proyecto_de_investigacion.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_5b050896c1044288b0813aa666a4a7dd.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_948662d4b503433c8de2f275b18b705a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0108eb-78cd-4e26-83a9-57d2bb4de3b8/99055532621.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/linksys_e3200_setup_without_cd.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/tennessee_comptroller_audit_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/townley_grammar_school_sixth_form_open_evening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c926541-e4a3-4a7c-b6bd-e55fd8fed6d8/what_is_past_consideration_in_contract_law.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/pentecostal_systematic_theology.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/where_to_buy_formal_dresses_sydney.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_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 5880 bytes
SHA-256: e6415681d508f7d35fc3c5669c9927e426bde56a2905acd43244e6cdce07893e
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 11024 bytes
SHA-256: c8f08c9ef9035a2b4a4153ba682626dc901af8c4de3f4f98eee62fb89eb5987d

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