Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5398b2692c3c19…

MALICIOUS

PDF

76.2 KB Created: 2021-02-22 02:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4f159bdadd51050fe6146aac772fabdc SHA-1: 410bcd6a23606c241665e05baca1fc5de1a14689 SHA-256: aa5398b2692c3c19b3fc09d94c255a755cc816fd2f85a73510e96460daf8a6db
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of multiple disposable domains and the use of UTM parameters suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=sea+monster+names+6+letters PDF link annotation
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/bfe9da59.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/MieVhjx/cars_vs_cops_4j.pdfIn PDF document text
    • https://fimizugowukabi.weebly.com/uploads/1/3/1/1/131164572/sanilitukazomapike.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/etyMMEJ/final_goal_meaning_in_english.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/kowirido-vezupizew-ginotixapure.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/lokamego.pdfIn PDF document text
    • http://xukekutotipepet.iblogger.org/37858748341.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/b67ecb236b1ad.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/dufewejodokivezopug.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/idggZgf/dovaxetumitebawufaw.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/mepipaw.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/288946.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/3jde0hj/desktop_dual_monitor_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/cRhiEB5/readingiq_for_teachers.pdfIn PDF document text
    • http://jusuxazamorum.iblogger.org/canadian_heart_failure_guidelines_2016.pdfIn PDF document text
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/bc89fcc1.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/1802986.pdfIn PDF document text
    • http://mimowetoxizov.22web.org/abdominal_infection_guidelines_idsa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidilud.rf.gd/alexandria_catlica.pdfIn PDF document text
    • http://pepagipil.epizy.com/sub_zero_refrigerator_ice_maker_manual.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_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 5088 bytes
SHA-256: c23ceaa63def76b82dc9edc0ac32aa8b95fa81a40e87204e27c54ccd84bfc25d
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 10328 bytes
SHA-256: 8f990552466065892b9be24db56eb1faff438a47c63d1175ba99b3d02e4993de

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