Malicious PDF — malware analysis report

Static analysis result for SHA-256 181c1cd99e16ad2a…

MALICIOUS

PDF

58.0 KB Created: 2020-11-20 08:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e3f8c892768462a6cdcc7694c8d5cb4f SHA-1: 2fc05139852395f04ea77de302e08a4959ecec9d SHA-256: 181c1cd99e16ad2a7b9544bf3b255d6d4f700f4f111079abe59e33f7ecd182a6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/aws?utm_term=move+in+inspection+report+template+alberta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f8fb029a46af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5fa8230e34428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385228/normal_5f90e575e1f23.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/rexigokani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fa250728165a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f9f33b67a6aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fa18fdb96d37.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/33104122-09b0-47e9-9f8b-e134e798d335/73158445946.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/remote_desktop_protocol_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d4a234-3e70-4c85-9015-d667aa6114b5/osrs_money_making_guide_2018_p2p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5aeb81-a0dd-4361-8a8a-d36bd0598e36/what_is_the_purpose_of_mitosis_in_unicellular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329bc7ec-7af0-4122-92fb-03f479352c6f/xikezu.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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 5284 bytes
SHA-256: 4a9897eb968472933eefec8573762117b90de24bf3c33e92a1fe813529fa8dbd
font_01_sfnt_off0000bf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3C 8288 bytes
SHA-256: 24bff965159d408b09ae292ca2949400b11a7951f533f41a964edc6528722a16

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