Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1443e7b19112706…

MALICIOUS

PDF

73.9 KB Created: 2021-06-06 10:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41531a9747e5e84bd9f24b444404fa70 SHA-1: 5a4dd4205fc5f5bae4c80640f5d24ee52ea652c7 SHA-256: e1443e7b19112706a262d0ce97ce72a7a13c47492bdd536bae8747ee7a650942
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9991

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://nomylo.ru/pbw?utm_term=banana+pi+r2+images PDF link annotation
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/70a1875c.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/9485508.pdfIn PDF document text
    • https://lidenezat.weebly.com/uploads/1/3/4/3/134382714/lavosogokuzowe-numalipuzuda-welovorasovafu-juduv.pdfIn PDF document text
    • https://lifadupelede.weebly.com/uploads/1/3/5/4/135401245/xoralolov_veguzorezedupix_jelub.pdfIn PDF document text
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/7306238.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/e5f98.pdfIn PDF document text
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/620d54368d5ffc3.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/4275a5d3c13.pdfIn PDF document text
    • https://bavifevip.weebly.com/uploads/1/3/6/0/136049805/vadekokolozogelawa.pdfIn PDF document text
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/3bc58464345c.pdfIn PDF document text
    • https://peburuxe.weebly.com/uploads/1/3/7/5/137517122/e86841f.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/nazigizoz.pdfIn PDF document text
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/wojivifob_ganega_ximajare_sepukekupolum.pdfIn PDF document text
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/2a097d9d.pdfIn PDF document text
    • https://jasuxazej.weebly.com/uploads/1/3/4/8/134875243/dagaf.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/a6e1a5b1c.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/mudewuvosov.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://buxozodevoge.pbworks.com/f/dasonoduwerinizu.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/holt_mcdougal_algebra_1_workbook.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/f/nclex_how_many_questions_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb17b89-2c13-4036-a171-de702b6c6867/difference_between_financial_audit_cost_audit_and_management_audit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b182a021-35cb-4b53-aec3-85ee18c20ace/zojesenizozemujideduzo.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414834/pifumosezokowuzow.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 4884 bytes
SHA-256: e942b5405f7cbb88b80c6b4cd1db19df192c8e755ad046d35e557239f7380999
font_01_sfnt_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 10924 bytes
SHA-256: c1584395e48d860e2a2ac60a5b271028bbebf1f8cd7054055f6d43333aa552b9
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3