Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace52c80d9765f3f…

MALICIOUS

PDF

71.0 KB Created: 2021-05-31 23:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 48d24946cffa8343c93af32d7d6c989d SHA-1: 9cabdd21f987b2cc12618fc42736ee20c6c7c749 SHA-256: ace52c80d9765f3fcfe517827bc1e82b6912d1e829d3122da02daf7144f34699
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, suggests a lure related to 'cardinal and ordinal numbers worksheet pdf'. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://huntic.ru/pbw?utm_term=cardinal+and+ordinal+numbers+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fe9cdcba4317.pdfIn PDF document text
    • https://nuxagaselupig.weebly.com/uploads/1/3/4/0/134016775/maguw-guwem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fe78ee508bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_60490cdd85f0b.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/6718784.pdfIn PDF document text
    • https://fagowegegex.weebly.com/uploads/1/3/5/3/135315381/xarozaz-wesanetexok-lofipa.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/9588799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475725/normal_6065fd43508bd.pdfIn PDF document text
    • https://simogewijak.weebly.com/uploads/1/3/4/6/134642120/6591032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_604e44e0f1575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5ffcaf85a8680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fe930e5838f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ff3cd3ae6a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_6056b52ced629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6051a5c4898f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_60590644f3ac5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144421254/cease_and_desist_letter_slander_texas.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/gw2_raptor_mount_guide.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419613/63516133589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05e1392-d485-45c2-9d5c-a4f798222775/ship_trap_island_quotes.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416721/captive_minecraft_map_1.15.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c25675-9e87-4e7d-819a-f3c34805cae3/how_to_make_a_hooded_cape_without_sewing.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/zizevekofug.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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 5480 bytes
SHA-256: 6692530646c7994484ce0ff94d873eb177aea5c07de0587d0e6ec39b47b17739
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10328 bytes
SHA-256: 4dcca25863c247f0623383c32830b8592d4aa2bb17046a295b2722bf9da23889