Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3474e39f1742d69…

MALICIOUS

PDF

79.7 KB Created: 2021-05-06 21:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f1aab9888bb4ecc54f73d3ad9eddcb1 SHA-1: 950b33684d5dff35b882b0975bc2400d6540e8ba SHA-256: d3474e39f1742d696b7d5edb4fa6e37abb4e7a4bde4bcc2d0a42b6ac6268729a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gimoguvi.ru/strik?utm_term=walgreens+humidifier+filter+cleaning PDF link annotation
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/kedukopelisag-kamewe-nitatonaxoman-bufadevodal.pdfIn PDF document text
    • http://tuwomisajam.iblogger.org/bedenin_dili.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/5281258.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/asageR0/kukiriluxijuvumunupuwoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/hcfc0hi/puzzle_bobble_mame_rom.pdfIn PDF document text
    • https://zobupasig.weebly.com/uploads/1/3/1/4/131438120/5997658.pdfIn PDF document text
    • https://cdn.sqhk.co/givefugonuw/fNDwihK/colorado_fair_credit_reporting_act.pdfIn PDF document text
    • http://medolufinumul.sportsontheweb.net/abbas_kasm_ibn_firnas.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/tcc_meio_ambiente.pdfIn PDF document text
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/be5778cf.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/hhid6hg/carson_wentz_injury_report.pdfIn PDF document text
    • https://lomobesozav.weebly.com/uploads/1/3/0/7/130774973/9f3bcbbe5.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/hcjeyhf/sajuzinevurem.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/ehgjh0E/sirens_horn_and_alarm_sounds.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/7lih6OR/where_to_go_gem_hunting_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kapopuvida/jaahbQV/2048_merge_block.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/g6hege5/31767143526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_1693f3fb28824e10a266cef645ac0ee7.pdf?index=trueIn PDF document text
    • http://nuwuzokapa.rf.gd/69846501199.pdfIn PDF document text
    • http://dozudaz.epizy.com/56995570812.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_aebcaba1277c4099abb4b34b9d3774ff.pdf?index=trueIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_f6b722d2cae443a18a1077739fc748ee.pdf?index=trueIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/kigamafam.pdfIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_89ea13c10782403eb21691d692cc650c.pdf?index=trueIn PDF document text
    • http://jawimazo.epizy.com/digestion_de_las_proteinas.pdfIn PDF document text
    • http://kawobos.rf.gd/modelo_canvas_lienzo.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_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 5448 bytes
SHA-256: e59869e0f7882ff6c49a074abbea2edf4e838d19c8081bcafa8cc33fbcdd82f9
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 12216 bytes
SHA-256: 4d0a09e619f21f8d0781d8cc18318c5090c2cc63af05a5c506d3db35b14c271b