Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9ef44ecd1f745…

MALICIOUS

PDF

73.6 KB Created: 2020-12-27 15:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d5e6864d00e57d8ac69e15bf5da5686f SHA-1: 54311a7ef37ae7a3a156e9a8347ebfb71e4ff8b5 SHA-256: c9a9ef44ecd1f7459af20b7ca628a84a35c06ed8b1acf7a3bc3818aa126062a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious websites, likely for phishing or SEO spam.

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://trafficel.ru/aws?utm_term=table+of+contents+template PDF link annotation
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/wowiput_xixojubajofu_tediseru_bebolivafaku.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/aa8c8c4620269ea.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/vaxifuduwurinemo.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/jeiDIfF/jiwenafigoradikuk.pdfIn PDF document text
    • https://dobuwejakunarek.weebly.com/uploads/1/3/4/7/134772316/3341804.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/eggSOha/wavanewenurirasajaboguxor.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/47083.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/ajhjcx9/kiki_camarena_death_aftermath.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/1069f5543d0fff9.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/dadupawo/basic_chemistry_coloring_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/busolepividusodoru.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/90063062325.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/gorulomi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/15019228737.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5156 bytes
SHA-256: 8e3318deeb9e1a3f956220661b5c2186369d44b99f9c24a4e5fd6c11601e3429
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 10040 bytes
SHA-256: e0e3f074138f60f95a8658b95f2ef7f01f5735350fc08d79ffad45e455d9d4bb

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