Malicious PDF — malware analysis report

Static analysis result for SHA-256 2062da6dde45ad80…

MALICIOUS

PDF

72.7 KB Created: 2020-12-20 11:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3591d7bcad3bc69e6c0c3071d7282f2b SHA-1: 9b5f3169eb6a0d88c9d5ca09f25b4d4fa46177fc SHA-256: 2062da6dde45ad80811f5871a6508f5e8b0cea7ddb57ce2cf131bfb59ec35084
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://traffset.ru/123?utm_term=poulan+pro+lawn+mower+reviews PDF link annotation
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/gekedolijito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fdb364b2d896.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/lesawileruvozi.pdfIn PDF document text
    • https://nasakavagupudo.weebly.com/uploads/1/3/4/7/134766537/vexisojuro.pdfIn PDF document text
    • https://kuwuxegizeduki.weebly.com/uploads/1/3/2/6/132695805/6782179.pdfIn PDF document text
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/8945776.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/ecdc4291-58c1-40d1-8811-453e764cb337/95693582884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6b0aa5-87eb-43ac-9390-a14280945098/pioneer_fh_x700bt_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc70c64f2297e36a9fc4e22/t/5fca17a5196a600d3c38d36a/1607079846585/fujagabefux.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/zupitawokisasimiposufolud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac1cdbe-ffe5-4513-bdf7-0f794daddade/64035960627.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/sebage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070fa8d8-30f9-4daa-b4e3-2f9404209a31/46725244657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81eed51-cb82-4189-9841-f265709e0fe5/online_paid_apk_downloader.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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 5120 bytes
SHA-256: c1f6ed8a975c916c3254f6aed656e15500886a3378c58d3e9749d5011098b9d8
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10428 bytes
SHA-256: ca85b6d4037f95e981872830a0cc74ff658021f29853d4f8747023236ad20d7c

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