Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a1bf25a71669c7…

MALICIOUS

PDF

79.7 KB Created: 2021-03-17 21:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b40eafac82723e2d6f408f72972ad28c SHA-1: 237c928797c31de65e110bcefe39a97f988a538a SHA-256: 98a1bf25a71669c7ab996182fec3da3134ed60ff6ba02cdf6fe8917c0272acac
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, with one prominent URL being https://jottigo.ru/strik?utm_term=weber+smokey+mountain+supplies. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=weber+smokey+mountain+supplies PDF link annotation
    • https://metuwudoguwo.weebly.com/uploads/1/3/5/3/135323448/jilis.pdfIn PDF document text
    • https://cdn.sqhk.co/mezewimaxus/ih7ggrh/cbse_class_8_computer_science_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5fc954b1bfa06.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/dederof_mobevof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_604ceb1ac1b1c.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/236121f584.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/rjfifha/voot_app_from_google_play_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453563/normal_5fc6b19f193e0.pdfIn PDF document text
    • https://cdn.sqhk.co/zanewijepex/rhftifL/jevilobekubakewizabujule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_6027b5852a198.pdfIn PDF document text
    • https://baxuzenaxifo.weebly.com/uploads/1/3/2/6/132681834/rutemi-bajuxewivod-vadajobivevego-bisoxenefute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423752/normal_5fdea2bd80c04.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/xewab-lanegikaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibejebovef.epizy.com/98648334194.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/how_to_fix_a_troy_bilt_lawn_mower_carburetor.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_28c7f473896c45f4b1e0dcbedefab43e.pdf?index=trueIn PDF document text
    • http://zewuref.rf.gd/zaluz.pdfIn PDF document text
    • http://mopizozusixunes.rf.gd/19719969521.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/asal_hzn_forml_nedir.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_4e379338b5e54c2fa9cbd5137987fce1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xujitezu/82318556721.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/alien_shooter_2_full_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/washington_gas_light_federal_credit_union_careers.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_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 5284 bytes
SHA-256: 20c4a6fe81b09b05846f2430d3df3e889f65d80da89b3675c176cb6bd1e547a8
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 11088 bytes
SHA-256: b74c571b16a67271a70a6a6c57049ddab54ab1e14588fe52fea3eebfac26c0a4