Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdac91646b26c776…

MALICIOUS

PDF

70.6 KB Created: 2021-01-15 23:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 517f84c79028fc8e572564745ad221a2 SHA-1: f3cf1c12cbc20f772ca713d98ac4d1377e43d3c0 SHA-256: cdac91646b26c776a1a4b897bf886333df20a6cf5cc4c143af64a392ae37332d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://traffnew.ru/123?utm_term=hiking+in+oregon+and+washington PDF link annotation
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/zogumotuzuja_moxododozo_piparo.pdfIn PDF document text
    • https://site-1175354.mozfiles.com/files/1175354/29118788555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fea2c5ed741d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f97e91e85f9c.pdfIn PDF document text
    • https://site-1172681.mozfiles.com/files/1172681/offline_english_dictionary_apk.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/zenobuwabamab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fc6bea36a125.pdfIn PDF document text
    • https://site-1172723.mozfiles.com/files/1172723/fifateberukapabidutapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5fdb1e8fd028b.pdfIn PDF document text
    • https://lirajibabu.weebly.com/uploads/1/3/4/6/134635624/61d0c98c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423728/normal_5f9d78c53fe99.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/eih4uif/kiwefawoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 5172 bytes
SHA-256: 6ccf4f00f75a90732696ea78300028476196a98401f7faa924e80642b3a740c7
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10276 bytes
SHA-256: b9e364c62417d9c190c33829fd76cf080a15aaf873873d1133a11f1fee56dfd9

Open this report in the interactive analyzer, or submit your own file for analysis.