Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf85af396359005…

MALICIOUS

PDF

81.6 KB Created: 2021-03-17 04:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 675a71707c507d3103c8b71c44835436 SHA-1: 2d15f534024eb1bf76bc98cc004fc9efc3f5b2bd SHA-256: 4cf85af39635900514c5458a34321bbe8edf14f708902b021f49749e88f42842
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, suggesting it's a phishing or trojan delivery mechanism. It contains numerous external links, with one prominent URL pointing to a site that appears to be a keyword-based redirector for search terms like 'spc manual 4th edition pdf free download'. The presence of a link farm and a fake invoice lure heuristic indicates a deceptive purpose, likely to drive traffic to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://golowaki.ru/wix?keyword=spc+manual+4th+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388819/normal_60002d6fc8c7a.pdfIn PDF document text
    • http://rubivof.22web.org/cirque_du_freak_manga_volume_9.pdfIn PDF document text
    • http://xowefew.22web.org/37154383225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc75588e3531.pdfIn PDF document text
    • http://populiro.iblogger.org/najakexunemugokanum.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/c13cb72e-a285-4c9c-b626-a24f4db63d6f/how_to_get_rid_of_gas_with_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/best_power_ballads_of_the_90s.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/jaboxi.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_e3e9f77cfd1a4c77b35296429f965d35.pdf?index=trueIn PDF document text
    • http://gafawazela.epizy.com/electrical_lockout_procedure_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525b814d-ea55-4789-91d5-0b9410eb94fd/samsung_superspeed_steam_vrt_plus_error_code_3c.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/61846061290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94a80e9-ed87-464a-a969-3da31951edbb/how_much_are_womens_air_force_ones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372f4b95-6a6d-499d-916e-2bb9a1b33be2/harrisons_principles_of_internal_medicine_19th_edition_release_date.pdfIn PDF document text
    • http://seluzapiz.rf.gd/odia_bhajan_dj.pdfIn PDF document text
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_e2cadeedb52a4237992ca015c8a0565a.pdf?index=trueIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_f50d64ae31ce4f359a67d44bcc2339e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/24132605854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9944df-3294-4281-97ae-00af9c76c503/literacy_discourse_and_linguistics_james_paul_gee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6732bc50-1518-49e1-947f-9aa55616bb33/bozetodela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e8d677-7cc8-407b-8959-56d9026c885c/is_dad_capitalized.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_ab68733d843f405e9c2252865c0e5832.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e54818-cc4c-4c47-b345-443e35949291/history_of_modern_art_download.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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 5500 bytes
SHA-256: fbf19d66ff81dde5c27b7fa18c57a2438343680526033fb95f5245133f655afa
font_01_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10756 bytes
SHA-256: 5ada0a48aa3c1207724d5ad4c4b33070aa5039bcfe11be1e9c98d406ecc8fe99