Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1134220106ebfef…

MALICIOUS

PDF

75.3 KB Created: 2020-11-13 21:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8793d20b781ed6c38f3310e52e5c9fc0 SHA-1: 717875fbc1c5b61d2ecfac6d1abde6cfb4d9c611 SHA-256: a1134220106ebfefd12ec5cbf2d9e25dbdf6e674f9f21c1bb944e51c6720509e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=top+paw+dog+harness+small In PDF document text
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/3890238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f92910f3acac.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/9474041.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/duxujapif_jumepolifi_luzilarumezo_zomiduxevow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f9508c862fc5.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/5249136.pdfIn PDF document text
    • https://lemurowivavaxub.weebly.com/uploads/1/3/4/4/134404776/1760112.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/98ff7fd8-da85-4792-b44d-ea64acc9bff0/nitexanipox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8fbb49a-9a62-40b7-895b-10d1c4a46853/jesemomozofiduwejotidug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b587f9-ae9e-497b-b2cb-d985a448d8ea/80171546359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e3468e-75cd-422d-94f0-881fd53712b6/bakafewarojinezaset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3119d72-8a45-4184-bd7f-83f593de3f76/sogudebovagazunofomojex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4dcadb-f6ae-40bc-a7f7-c45c4684d467/lutajetijuduteledan.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_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 5416 bytes
SHA-256: 7fa6a07a3468007025c4f81790fb9e6380b25c6630e2441946791b0532aa10ea
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10588 bytes
SHA-256: 6d8c9a7521f78e41307d95a09fb932c973ffff2f1ea610a9043b22eae0d28bd3

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