Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8fd2afef778c67…

MALICIOUS

PDF

80.1 KB Created: 2021-03-07 19:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 335d85dd60b97a8354237b9bb4d5e147 SHA-1: 3e8965d81e3611f203707009af0964abe4a62448 SHA-256: db8fd2afef778c6786ea8a60da7719aa780a78338986b7dcb91723d0bd0473cb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with multiple URLs pointing to disposable hosting. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded content, though largely unreadable, includes metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links indicates an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wb?keyword=2008%20dodge%20grand%20caravan%20sxt%20engine%203.8%20l%20v6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5ff18332a8b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_6022ce8fa74d1.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/tiigeJr/toca_hair_salon_3.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/fTPbsjc/74905531622.pdfIn PDF document text
    • http://filuniguwol.22web.org/dedokaxopoxip.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/ijfUhdf/dimodotiwesun.pdfIn PDF document text
    • http://tupakewufitid.iblogger.org/facility_maintenance_schedule_template.pdfIn PDF document text
    • https://cdn.sqhk.co/gozajare/GhchNhb/66633606934.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/vepazufadabaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/Y1jjiFg/mowetevonifipena.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/temixafegugilu.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/hjirXia/wujiwub.pdfIn PDF document text
    • http://pixubak.iblogger.org/sugowipejibozilutog.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/6877163.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/Hhfiagi/netflix_cuties_review_imdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5febcccd12bc9.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://zizakipu.epizy.com/wwe_battleground_game_free.pdfIn PDF document text
    • http://wabiraxo.rf.gd/2017_chevy_ss_service_manual.pdfIn PDF document text
    • http://betewegomoge.epizy.com/encyclopedie_diderot_english.pdfIn PDF document text
    • http://tugojolowok.epizy.com/9641386256.pdfIn PDF document text
    • http://rakejobik.epizy.com/number_tracing_worksheets_free_printable.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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5748 bytes
SHA-256: 94742f31a21a6b6a6a3e5495266115a76bb4dfec1f95c90737a4ef1b9c990db8
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10540 bytes
SHA-256: 65439955427a7aa065ff18e04e7fe031560232b247f2c957ca0c6620704191d5
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3