Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80b2f0a588c8fb1…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 05:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec4a1899cb8c2b04b97cd0e1c359331 SHA-1: 163f6cb5e64f098912b0a154a81e9483b991e67c SHA-256: d80b2f0a588c8fb1d6711f4cc3bda793def812b2a42d3d72f3c31adf835c0063
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 SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=human+sectional+anatomy+ellis+pdf
    • http://foxinawolukomat.iblogger.org/ximuburavuselexixus.pdf
    • https://jomimufigaz.weebly.com/uploads/1/3/4/3/134319247/4fdf503514bdd7.pdf
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/zazegagenadal-pifufobaxifefuv-luwojapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_04b8a8e8654242d4a20b11097fd38f6f.pdf?index=true
    • https://s3.amazonaws.com/wozowuledij/17708606471.pdf
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_4b382d88f7414bbe9e7965b1e891be30.pdf?index=true
    • http://rukubas.epizy.com/simple_keto_meal_plan.pdf
    • https://s3.amazonaws.com/kujesulad/jetpens_mechanical_pencil_guide.pdf
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_37b641b1b64c4fa187306c977454dc77.pdf?index=true
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_386174975dc84f6bbcce01a765ab815b.pdf?index=true
    • http://modudupudabu.rf.gd/general_psychology_book_for_college.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_78395c6c45f640688ad80c2591ee9497.pdf?index=true
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_ffb774e8c606499190ffbf93ec9d2b9e.pdf?index=true
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_fb6a8a93f48444b6a6232f0855c4b526.pdf?index=true
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_e35ca0a98d454a2592a14352718d758f.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_55f5fe46f0554481be13f657064af405.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_off0000ecef.bin
895c51e0fbb4f074435a0026c680f003041266500d71c8ac3ce29f279026cd55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5268 bytes
font_01_sfnt_off0000fed3.bin
78914397905f76fa8aeb715b6157b395e866fdc32d7bf803e33ea3c783607916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 11084 bytes

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