Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ca951d5b986681…

MALICIOUS

PDF

65.8 KB Created: 2021-01-11 09:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7eecb0a0fa1cdc7c3a5bdd94d4cd8749 SHA-1: 0e98f8e2dc38e982097b80bead7190bd994189c1 SHA-256: 25ca951d5b9866817bf3dc35873aaf4a9cf0a1187d84362d58789f1453b35e09
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-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://trafffi.ru/aws?utm_term=school+subjects+word+search+answers PDF link annotation
    • https://kukezuleji.weebly.com/uploads/1/3/4/3/134361302/7235672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fb49d8435b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5fa149b6c33b0.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/5194461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5ff6676a6211e.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/9060165.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/ironmaster_bench_pro_review.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/jalozilimuz-kevovunozad-xulagurudoxovaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f9018a8daca4.pdfIn PDF document text
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/bd4fd56.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
    • https://s3.amazonaws.com/fifuto/apache_poi_ooxml_3._17_jar.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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 5272 bytes
SHA-256: 8c9969662f8e8c686f9b4b76b0ce3929edba282a723e39bbb19771fd44ac553c
font_01_sfnt_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 10204 bytes
SHA-256: 5802185327dce8f4f552d22b902e79d1f98ccb3c68976e5db19f8b1a8f07483a
font_02_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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