Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f23ce1f4fb7a993…

MALICIOUS

PDF

80.1 KB Created: 2021-03-12 21:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f356e7a0ebc9ce0203bd73a5e0494ea SHA-1: 1bf2dc1c89287cd1cd7ebb579639f5043c292af8 SHA-256: 6f23ce1f4fb7a993a9dc24a25bca58c2b4b370b744f897011cd808afc89d2bfa
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://crophysi.ru/strik?utm_term=beretta+92fs+trigger+job+in+a+bag', appears to be a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=beretta+92fs+trigger+job+in+a+bag PDF link annotation
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/pemigilijodaxuko.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/458588.pdfIn PDF document text
    • https://velademepol.weebly.com/uploads/1/3/1/8/131871907/mosovefeninowa.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/cagg1he/nivin.pdfIn PDF document text
    • https://cdn.sqhk.co/gorusuvu/jegggcV/company_project_approval_letter_format.pdfIn PDF document text
    • http://polfact.site/76221957028hmch4.pdfIn PDF document text
    • http://myyshooop227.site/19297218100iumj7.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/riiifY8/63756301575.pdfIn PDF document text
    • http://disconto50.info/any_video_online_url_iphonem1535.pdfIn PDF document text
    • https://cdn.sqhk.co/bezupidokaz/XK0Ux5B/anti_stress_relaxation_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/jj5AngS/37482764276.pdfIn PDF document text
    • http://vizit.store/bizegenezisonisec299p.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/PhjaLhj/t_mobile_ceo_john_legere_salary.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/zepetujew.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/gj3ha6J/scanner_911_for_iphone.pdfIn PDF document text
    • http://meinekarten.best/independence_day_speech_in_english_for_school_students_2017zneo1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_b3ad9a9adcb74ba2814f5c3cc7ea60bc.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_cfb1da5d86d94303ab7d075d4b931b17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/8406143419.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/pegosiximofetarufepuguseg.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/tofawofukiwelafuz.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_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 5456 bytes
SHA-256: f62d727cc26d0b17dae5b51d0173157132f6bbc4150cbcd6470fbe59e548055c
font_01_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 11256 bytes
SHA-256: 546cd1f2d355a868e9c5257e7f03f092129034075cc9c5f92bbac32b04377d47

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