Malicious PDF — malware analysis report

Static analysis result for SHA-256 853bc8ca0ede3783…

MALICIOUS

PDF

73.5 KB Created: 2021-03-21 08:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e479d4c2396d14b28e459e4591500a SHA-1: 9abf8d626603bf9b8b765f2c7bb7680703022be7 SHA-256: 853bc8ca0ede37833984a1f773b79188080462b3c8be9a255dcd30f67176aec4
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 to other PDF documents, indicating a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of numerous external URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=women+after+ww2
    • https://cdn.sqhk.co/bodorosuzuta/iFhgdgg/dilejidolosojoro.pdf
    • https://cdn.sqhk.co/pivokazi/ePia7jc/samsung_notes_not_working_properly.pdf
    • https://cdn.sqhk.co/jotenitix/5gcDh1L/47324011697.pdf
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fd62bf8e7332.pdf
    • https://cdn.sqhk.co/rapovixovuti/Ugg8zlL/2993509187.pdf
    • https://static.s123-cdn-static.com/uploads/4463298/normal_5ff4eee85bd09.pdf
    • https://cdn.sqhk.co/doxanusubomo/xeggj5J/ganapelipafutusoxe.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_6027a81e46577.pdf
    • https://cdn.sqhk.co/tabewinudeka/bvlEhg9/experiment_z_zombie_survival_mobile.pdf
    • https://cdn.sqhk.co/ketusugedi/ja8IjaC/23070608745.pdf
    • https://cdn.sqhk.co/vuwonesi/Hif9Pjb/xifatorebotokoviwu.pdf
    • https://cdn.sqhk.co/remowiwa/xagftij/24127556536.pdf
    • https://cdn-cms.f-static.net/uploads/4369629/normal_604ee246f116e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_7a14cb299f0c4f6989a8a7046fb9201a.pdf?index=true
    • https://s3.amazonaws.com/lusegokaves/26459665233.pdf
    • https://s3.amazonaws.com/setaxilitozuko/scrum_master_cv_template.pdf
    • https://s3.amazonaws.com/zurovajij/monster_legends_guide_reddit.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_3062d50d5e86464c93bb3e82ac8040f5.pdf?index=true
    • http://dapizodipe.myartsonline.com/duriwuwagukegivikezun.pdf
    • https://s3.amazonaws.com/gixawetopoli/malagalejo.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_f004bb5b2f804d54bd6b3fbcb0f02e1c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b4.bin
7b4c5aa48fcae24a57c32c03745f9bcaf2c864baed4de3fa1ceecb5fb0646280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 4940 bytes
font_01_sfnt_off0000f483.bin
7098c08f35f87988d4e43ecceff43dd7d0f7f76a22e9ddd0f28913c5e8d6e733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10768 bytes

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