Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7f8f1039d5e82f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 20:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 874138834dd24cab35e134113291b60a SHA-1: 4101ae4a1800faa971867080b5990d10d95497b9 SHA-256: 1c7f8f1039d5e82fed38cd0767b615847054e2473996d67f132e49192e89f6c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://botokaw.ru/strik?utm_term=boy+scout+fly+fishing+merit+badge+requirements PDF link annotation
    • https://cdn.sqhk.co/bisadidizi/egfc5f0/gasadikagaluberozavapeto.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/0hbjdic/53364844519.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/vigije.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/ehghb2I/tap_tycoon_investment_wheel.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/89JNdgg/64789724349.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/d0yifb6/xavilaroruwonedejofepo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_241c52a02fec42c3a0cd248c5759ba42.pdf?index=trueIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/348369073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e98a9d8-0842-4eb9-a7de-8e5ed596997b/programmable_logic_controllers_and_industrial_automation_book_free_download.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_6fd09d4dd85b403484a828031f8f3eea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f32fd8-c0c5-40cf-b7e7-46a68c31f0df/pusek.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/80670992121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112b8043-bd50-40de-a68e-033c58407d81/toro_lawn_mower_20332_air_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25dfd89f-202e-4bb8-bbe0-9d1a787d8292/lirogokabojonofobetavot.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/blouse_pattern_making_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6727ae32-4d95-4540-828b-32107f540f2e/where_can_i_charge_my_mustang_mach_e.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/lanipenedufumonekeganus.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_45e7e369c1104f77ac6d155cf73653cd.pdf?index=trueIn 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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 5852 bytes
SHA-256: 4465e5c80c0112ceb2859967d45aa1a749248893a2e6cf992627e867b0743b11
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10668 bytes
SHA-256: 37a1229b68e6e6d7e8bb81498d91abd63e7bc86c1053b4ca758a7218b901cb7f

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