Malicious PDF — malware analysis report

Static analysis result for SHA-256 a213bd30201ce759…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 10:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 80b2be31631d93f0c2ece8e465c7d729 SHA-1: c58f64a4ba72c27317804884c13ce1346da4ea04 SHA-256: a213bd30201ce759d46179c9d294bd528449b0ab81979d6bb7eac7152d2e8c9c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/123?utm_term=free+books+pdf++app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5ffb06da64895.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/zXwjije/dome_of_doom_hack_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_60556620be7e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/UyaELDx/designer_city_building_game_hack_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5ff93502ef505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_60414a6148c74.pdfIn PDF document text
    • http://lixixivukagoda.66ghz.com/vobilufizufurifumuxar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6016c5da2cdbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_5fd63f1669cb1.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/WZhgemG/bones_the_crack_in_the_code_full_episode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_60580aa6a52e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e9521d-0f2d-49f2-ba2c-1edce9a3c5e4/wogulurarepexutipulugoja.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_bebef05b2e1248d38b3692c0d808c2e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00cfb743-7486-4173-84e9-47922c33599e/63517880995.pdfIn PDF document text
    • http://sivumokevidosib.rf.gd/magupejulaperipilakun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260fec62-ef74-4bb6-95de-e880ad0a4f4a/eaton_transmission_service_manual.pdfIn PDF document text
    • http://rixogom.epizy.com/which_bible_was_used_at_the_inauguration.pdfIn PDF document text
    • http://lolowavedipugis.rf.gd/gujujuxe.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_67f4bbf7ef724cb6b53406cebd8c9e7f.pdf?index=trueIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_a7f106e410944e35aa69295254ca9688.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_ce67ec4af4d64058b388a544ebc53f0e.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_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 5164 bytes
SHA-256: 93ab454547fd6e4ab88934bbe99d8d2d4addcb568fcaf5c6c60dde91352ccddc
font_01_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 11196 bytes
SHA-256: fd1453214acfb4bfb2dae4f0d29cc51709055bdffdfe30df9943fdfb20ea3dd3

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