Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e05e92a758d779…

MALICIOUS

PDF

70.5 KB Created: 2021-05-27 23:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f6b3914e0b35121db7871f177955c50e SHA-1: e03df539bd674b434aaef593d32ee8755109f52e SHA-256: a7e05e92a758d779520c78cca4c1cafe3e078f8da7eb7694232ec92cf282b8b5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing or malware distribution attempt.

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://dugedepap.ru/strik?utm_term=louane+si+t%2527%25C3%25A9tais+la+accords+guitare PDF link annotation
    • https://mowewudogib.weebly.com/uploads/1/3/5/3/135310369/3127656.pdfIn PDF document text
    • https://lawebigatu.weebly.com/uploads/1/3/1/4/131453175/kinekodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_6006a3d020605.pdfIn PDF document text
    • https://zivuxava.weebly.com/uploads/1/3/5/9/135991205/cf74afbe1ff103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6049ba6581c28.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4365655/normal_60afee6a88f2a.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/0f45d7796d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498986/normal_600fcc0527eaf.pdfIn PDF document text
    • https://tedatigajixa.weebly.com/uploads/1/3/0/7/130739480/2930335.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/vinapiwuzijekixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_6059c7734ac5a.pdfIn PDF document text
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/watuje-duzovebupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5fdb1a49d7eb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2684eb-ceca-4e00-a38d-b7330e8b4b22/1914002447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f353c3f2-7e67-4561-98d1-2a11c9d390a8/57871664274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda6bcb2-9a9b-4527-b1f5-a8fad4d1b2f6/yamaha_125_dirt_bike_for_sale_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e8007e-aacb-408f-a5dd-f73f9c5d9dd0/77193474293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ee0cf9-38ed-4a48-85c5-a7d547424027/best_50_inch_4k_tv_under_500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7be7aef-60f0-48ca-b6c9-85ef7cd5f098/craftsman_27cc_weed_eater_pull_cord_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71eb74b-4695-4dc4-86a4-178f91d8399c/45053766371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeb6e51-dc9e-45cb-8c53-f399fb3aa932/grammaire_francaise_exercices_gratuits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9c7557-ae45-4f26-956f-dc4303b881bf/bsa_6-18x40_sweet_223_rifle_scope.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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 5224 bytes
SHA-256: f87bf75612345323d2d8b70354e795534eb7009e94926ac030e5f8ea23d091c7
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 11696 bytes
SHA-256: 51f183bc872206ba9fe5435034dcd41a88a026f048f5156d784a9a524e096a7e