Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f90b6da6057cf48…

MALICIOUS

PDF

87.8 KB Created: 2021-03-22 04:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 737aa2b7e87a3e042ba517d68d523979 SHA-1: 1e5918689a26278909454ffcd46c46ed3f3f382d SHA-256: 3f90b6da6057cf483ae462b030e8ef91527672315cafe2fb47abcf98ed7e416e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm hosted on disposable domains, indicating a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://resalured.ru/strik?utm_term=knight%2527s+move+thinking+conditions PDF link annotation
    • http://jisipajimeleja.22web.org/whirlpool_cabrio_top_load_washer_not_spinning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_6010ffe85b60a.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/lamofera.pdfIn PDF document text
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/tapirezadesatuj.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/2733855.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/gcKjjgh/mivuguvozekuvexi.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/zoxigumusubusis.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/diijjha/44698463599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_602c4731f0e4f.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/gesup_zikulamilop_dogoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_600d4175b39aa.pdfIn PDF document text
    • https://cdn.sqhk.co/pidikuso/w0iiYjj/xolejites.pdfIn PDF document text
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/todudenirirab.pdfIn PDF document text
    • https://kipewupariwigel.weebly.com/uploads/1/3/1/3/131379586/38fbacb0f.pdfIn PDF document text
    • https://tufafoselebore.weebly.com/uploads/1/3/5/3/135389740/108229.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/marsh_hill_primary_school_ofsted_report.pdfIn PDF document text
    • http://gukapeb.iblogger.org/fados.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_60171835b46aa.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/jexob.pdfIn PDF document text
    • https://pudebotajiv.weebly.com/uploads/1/3/4/0/134012430/410dca.pdfIn PDF document text
    • https://laniguxademe.weebly.com/uploads/1/3/1/4/131452878/4204968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483071/normal_5ffbf5418059b.pdfIn PDF document text
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/3649561.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/bialshj/brainstem_cavernous_malformation.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/fopokasoxebovazoteni.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/b661378f0b78d9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolasuwukino.epizy.com/behringer_xenyx_1202fx_user_manual.pdfIn PDF document text
    • http://vadibezodaxilez.rf.gd/rojibovejabezuka.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 5140 bytes
SHA-256: b658376f175b8e69ab9e2095d60f6c03612321f6fc0840fb0069a27d1e1ce5eb
font_01_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 10672 bytes
SHA-256: 8d1c7aa9109ff808f25a188065b48fe2284214fd63cc290a14eb2c60706ded3a
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501