Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d6774c9827fd83…

MALICIOUS

PDF

76.9 KB Created: 2020-12-15 08:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e17bc0018876323b0c661a28a2238a52 SHA-1: b6613ecc377d5f35695467c268d89b8d064a3436 SHA-256: 33d6774c9827fd8372ee1f13db439731d7c3e386324209b96a8b55ce6018b600
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious sites.

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://trafftec.ru/123?utm_term=john+bogle+common+sense+on+mutual+funds+pdf+download PDF link annotation
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/jorud_jatewedebufobug_zuvokivaxagulek.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/rijulojen-xaxoxerivimib-kiwonos-fewuxemigugip.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/gelaxagi-gukadaz.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/xinopamerosadopugo.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc50966f7cf8c7540456227/t/5fc6a1ee4f98375720c8d764/1606853106337/96570541089.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/venovemojirununenokop.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/7980733589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f5db79-de56-454e-9988-13a2dad4309c/vuxunekefijatasuna.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/rajiw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56f218787e879898a6561/t/5fd6b41db1c3f31c7a8e6fd1/1607906333714/velidusomutimiwasamix.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/traktor_kontrol_s2_review.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/44678147537.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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5696 bytes
SHA-256: 07cda40c6f9d4934edc5e208734c168bf4ba3f952f9df456e7f31701d7f17627
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10756 bytes
SHA-256: a11cdde2dee45d9359821e52812750c043976ae77990e4fc9411b49df459a45c

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