Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fad063d7a883ae…

MALICIOUS

PDF

74.3 KB Created: 2020-11-19 00:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1ca2a3a5fd0e2f66a96cd29b133ec50c SHA-1: e7d50acd6977ddb0c07386fc94348689a690e0fa SHA-256: a8fad063d7a883ae4264ceb5eb6bce4e91483cd3e2c1683b147911531e77a5da
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffset.ru/123?utm_term=ninja+vs+samurai+tv+show', is suspicious, while others point to benign content, suggesting a mix of lures and potential payload hosting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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://traffset.ru/123?utm_term=ninja+vs+samurai+tv+show PDF link annotation
    • https://pagugedupe.weebly.com/uploads/1/3/4/2/134266786/7ef8ec6dd96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fa4b81b293ce.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/jalasilunaz/koraripaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8631b6-206a-4518-983b-a850c339d428/40458441831.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/50706821174.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/vepuzipik.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/mypascoconnect_sign_in_student.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/89099626291.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/8.ns.1_worksheet_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/sedoluzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9338156c-407d-488f-b53b-367f3dfd43b7/opengl_amd_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/national_night_of_prayer_for_life_format.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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 5092 bytes
SHA-256: b27e48e82e77ee9e119a8bc3972ffb4367daeb03c197bbd40844fe6bcf929387
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 11840 bytes
SHA-256: f0163cc56f190e6df47b742dfe2dd0a80b2ae25bb88e3f31b2c016127ccdc129

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