Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a45823d289981…

MALICIOUS

PDF

80.0 KB Created: 2021-05-11 07:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: edfa4841dfb741c58300cc381bf55a75 SHA-1: ef52cb4ac6ab0a67b0150d20df39529c48119f70 SHA-256: 7b5a45823d289981c82df8046fe84e9e1bb4708facd999e36c54292e833a8126
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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://jacksth.ru/strik?utm_term=2001+lexus+is300+2jzgte+swap, appears to be a redirector for SEO manipulation or malicious content delivery.

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://jacksth.ru/strik?utm_term=2001+lexus+is300+2jzgte+swap PDF link annotation
    • https://funobijego.weebly.com/uploads/1/3/1/6/131636789/zipedeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_606e10dc15c6c.pdfIn PDF document text
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/dovosobo-biwowa-bodurobivipa-nawebolumijiw.pdfIn PDF document text
    • https://zitobejamowimuk.weebly.com/uploads/1/3/4/6/134623616/407646.pdfIn PDF document text
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/rufavilawuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fdb170d2b3ce.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/modazejumusij_dimugajuru_tozebuzito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_60270f35b629e.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/cfbe5b37bb1637b.pdfIn PDF document text
    • https://mifoxafakefan.weebly.com/uploads/1/3/0/9/130969175/6389164.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/fc28069c-90e5-4fcc-addc-3cab0d1a37ad/how_to_get_rid_of_pimple_marks_and_scars.pdfIn PDF document text
    • http://ravotosaxubepom.epizy.com/knee_exercises_after_surgery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb25e784-710f-4b68-8c71-cb0473210fe9/stihl_fs_56_rc_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be56052-1deb-4f2c-9eca-0e3814d20924/gukuwaxa.pdfIn PDF document text
    • http://nanugubodiw.epizy.com/biochemistry_basics_pogil_extension_questions_answers.pdfIn PDF document text
    • http://mujevevurisul.epizy.com/88279657370.pdfIn PDF document text
    • http://wutazujedumixa.rf.gd/cardiac_cycle_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81585219-d0d5-49dd-b237-2be0ee21e3ac/totaluwukavedovat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43aae101-0b16-4473-a79d-7b2d9cd331f8/88254951482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f731a777-b3c6-4edd-a9ee-89bdb85ef14f/how_to_write_a_needs_assessment_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c4a050-920b-4d57-ac45-7a9dd0089de1/wazotafujajavos.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_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 5572 bytes
SHA-256: 25f283132ae4a51a56c46274a3b3b60bb9ce31ed9e2015ce0f378dc35144dcb7
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 10940 bytes
SHA-256: a8d186d3e33713111555388c94a7c5d37ba2720429cea38eb9438a785e7b1cb8