Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee40e3c58586c496…

MALICIOUS

PDF

107.7 KB Created: 2021-02-24 00:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: bfa64190f2587896e2f3ce71b6a8d619 SHA-1: 15a46ed4fbd29849826f5ced7e375d3669b30798 SHA-256: ee40e3c58586c4966a093c79ff12ad55f5f45c37fbb85f66684c6d2c345435bb
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 SEO-optimized and point to other PDF documents, suggesting a link farm designed to attract traffic. The primary URL, 'https://druttle.ru/wix?keyword=gta+5+hack+tool+free+download', indicates a lure for users searching for game hacks. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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://druttle.ru/wix?keyword=gta+5+hack+tool+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470209/normal_6030131ae9883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_6009947351ac6.pdfIn PDF document text
    • https://karewugudamebag.weebly.com/uploads/1/3/3/9/133986918/tarewonitaso-rekujeruxav.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/kafudoteruwabojinaka.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/6882423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5fe1c3a89eeed.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/fcUjiDF/32918229041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_6026322840fe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465905/normal_600bd4eab5e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60150db84aa45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuboki/dragon_ball_z_android_21_age.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/accounting_information_system_ais_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/fishing_guide_bdo_xbox.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/cdc_immunization_guidelines_india.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_off00016265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16265 5244 bytes
SHA-256: d39ebdd90d56dde4f0ae604343eb19fb3f041f27c99289c9845ed2c70d95af1a
font_01_sfnt_off00017452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17452 14232 bytes
SHA-256: 2b147e8f610a157ea1cc193142de01b11c34a120b25b5917b3c9b42e72a158c5

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