Malicious PDF — malware analysis report

Static analysis result for SHA-256 123c9ad3011d64c3…

MALICIOUS

PDF

68.4 KB Created: 2020-11-24 06:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c86b8a642837f2885b238f0e3c0986de SHA-1: 9eb19b533cb66e6def2ee80fa065733c7fda364b SHA-256: 123c9ad3011d64c393c43663bee8e0745e475c5510c816b10e8fdca5615d3e48
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically linking to an SEO redirector that uses a popular video game title in its URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=zelda+botw+keo+ruug+shrine+chest PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f92f2931b6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f8bd78888012.pdfIn PDF document text
    • https://porokademapu.weebly.com/uploads/1/3/4/9/134901730/sakavowezubuxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5fa34bc81399a.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/pazifetanegapu/78422601561.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/ramen_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/kizumijemijaxizi.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/ccna_4_chapter_1_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/39333634489.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/92415627212.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/walujomoximi.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_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 5452 bytes
SHA-256: 12ee6c964ef962eba18dce5d85e2e06ae5f1c71384875d553202e5bab1877209
font_01_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10408 bytes
SHA-256: 0a14087f89035be3b321a2625a6b7a8142d96f0efa56ab1e9dd25f1ea1ad82c6

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