Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3121fa0b0c5180…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 10:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c558c9c01bda4e8fe21bb8389172d232 SHA-1: ff98ae9ccf4fb90fd17c142fa97036552c747e0a SHA-256: ad3121fa0b0c518026c9d02fb3a9d3ebb0c46d48145868396ad609310d8050d0
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 point to potentially malicious domains, indicating a link farm or SEO spam tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

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://jacksth.ru/wix?keyword=rockford+cross+country PDF link annotation
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/893ca9c1c07.pdfIn PDF document text
    • http://dkmz2.club/19054379744r6u3z.pdfIn PDF document text
    • http://deemonatrafik.xyz/mamuwepudatadamewa640sh.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/the_wait_book_freei4uv9.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/nujabexunoli.pdfIn PDF document text
    • http://pet-guru.shop/jozurudoxijoluvofimv9oju.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/sojuravewi/79046960230.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/hayabusa_gi_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/charmed_season_1_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/curso_de_ingles_gratuito.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/is_el_pollo_loco_keto_taco_gluten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/elastic_and_inelastic_collisions_multiple_choice.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/15547730182.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/durutafezugobu.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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 4944 bytes
SHA-256: f4f7e89aac55e2d04d183110eb29745b922689f5c515de70b5c57aa4928b3d89
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10868 bytes
SHA-256: 10d5340a2fc94a6660d3f1d31673856cda0f8e1393c533fce88e03ca72762d75

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