Malicious PDF — malware analysis report

Static analysis result for SHA-256 feab54e1939a89c5…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 13:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5eb4eac7099c044d75feb7b25cfe6abe SHA-1: 8216d031c6ea7564b6eb50a54c924ee01820fc47 SHA-256: feab54e1939a89c56157a03c5c33c247cf1f628b3b782cf0d37b01d4e012a4d3
206 Risk Score

Malware Insights

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

This PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/aws?utm_term=american+government+and+politics+today+2017-18+edition PDF link annotation
    • https://cdn.sqhk.co/gefimiwotux/p1UhdA7/warfighting_functions_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5fd7f4bfb6c26.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/jbicQhg/39032728399.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/jdXT3gf/buy_on_ebay_with_visa_gift_card_paypal.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/Zjcgdhc/amazing_bounce_bakersfield_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/hgRgdjf/94377494008.pdfIn PDF document text
    • https://bumibaniligaza.weebly.com/uploads/1/3/1/3/131383581/9906282.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/gggiahf/curt_equalizer_hitch_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/gimanoretev/jcjaaza/best_free_barcode_scanner_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd3da489ecca.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/ivhgAjc/57200110487.pdfIn PDF document text
    • http://vebejisidag.66ghz.com/ibpsguide_gk_capsule.pdfIn PDF document text
    • https://fagowegegex.weebly.com/uploads/1/3/5/3/135315381/dubaluwabagama_vurokinevozopis_vidodapof_wikuv.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/RkhhShg/duzup.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/zizulamofusina_tawarego.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/mawajexijinakapofo.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/9ziihcH/livogofiwatajufuleri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5feed6cf7ec62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_5fd9ac6f5aa39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://debetofewozuri.epizy.com/babuxepejomofobudoki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 5964 bytes
SHA-256: 1f1fe6d8255b0992a394888d3cb31d458fef261454d082fc2bb3d3d8d060df49
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10800 bytes
SHA-256: bbf6579935bb97b4c84c3207bf56c91b656a2c6b6d665b37badd743dccc88b2d
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3