Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6196992119ee09…

MALICIOUS

PDF

67.3 KB Created: 2020-11-18 09:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3bfdc255c0a0f49973708fb0d7610f49 SHA-1: d74ff7aecde94426e8f7f876827f03164a2bf501 SHA-256: 4f6196992119ee09b3e9ab57a63f1862e35352569431cdee0ba106178fcf39ec
156 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 0.9998

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/strik?utm_term=learn+german+with+stories+audio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450039/normal_5fb32cd331834.pdfIn PDF document text
    • https://xukaxikerebata.weebly.com/uploads/1/3/4/0/134042698/163ad7a4c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_5fb39a552d2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_5fae46f91c3c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8a1b1fa708e.pdfIn PDF document text
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/2626244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f8d3e0e55d97.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/33165d3f-5bec-4c15-a88f-148fcade3778/jojamod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a524ea67-1ab2-4332-8e16-3dc8b704b3d4/xemizuvepepano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1afa4fb-428a-4128-8a31-dc30b7bf0cf3/21806760015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f08bd5-a514-4c55-8b93-81b59ae453c7/92049370713.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/2075850424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9f9fbc-fdd5-4e4c-9151-6776368d442c/rujikivigonosokiwavimawo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA46 5240 bytes
SHA-256: 5a1059b3a3eab58f8c00b8703e40ace8c838d7071f3328e84f7babe68e3804e5
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 10816 bytes
SHA-256: 163429c37a2f04970ddec831662f35bf413208de502950c70e3172135dfecf8b

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