Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdbda0c5b461316…

MALICIOUS

PDF

74.6 KB Created: 2021-06-06 06:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38bd5061a075fdd57e307fa21848bb0c SHA-1: 9a5fe58963c728958e9ec623876ef31187e1249a SHA-256: 5cdbda0c5b461316bd9e57e271ad5c3411aef2eb0202fbc4cba00921e84a9ed1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO poisoning or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead the user to a compromised or malicious domain for further exploitation.

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://philabc.ru/pbw?utm_term=definition+of+home+economics+by+different+authors+pdf
    • https://static.s123-cdn-static-d.com/uploads/4408595/normal_60b238cd73f86.pdf
    • https://static.s123-cdn-static.com/uploads/4470221/normal_5fec0491795ea.pdf
    • https://cdn-cms.f-static.net/uploads/4408601/normal_6023f03e69b6b.pdf
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/werimone_rebulox_xubiguxogimi_rojomulen.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/a9d2e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vibasuvezuz.pbworks.com/f/driver_asus_a455l_win_7_32bit.pdf
    • http://kevuxezedila.pbworks.com/f/5947581058.pdf
    • https://uploads.strikinglycdn.com/files/d77df17a-9a02-4a52-959d-3df791f4cb19/belorolim.pdf
    • http://bemulopawed.pbworks.com/f/16726612728.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412137/how_to_install_bodyslide_fallout_4_vortex.pdf
    • https://uploads.strikinglycdn.com/files/d16f7306-e558-4355-bc4a-17c449dddb0f/danby_dehumidifier_pump_drain_hose.pdf
    • https://uploads.strikinglycdn.com/files/578c48b7-8afd-456e-87cd-ce5f38802a4e/82692680494.pdf
    • http://sirazumebow.pbworks.com/w/file/fetch/144545163/behavioral_interview_questions_and_answers_for_data_analyst.pdf
    • http://ragasegena.pbworks.com/w/file/fetch/144640308/titazituxiloj.pdf
    • https://uploads.strikinglycdn.com/files/59771f01-cc14-40be-8aba-29bfb08b4900/juwogarovasavegesexulugax.pdf
    • https://uploads.strikinglycdn.com/files/474764b2-d8ea-4a22-90e0-9ee137dbcb8f/77358210305.pdf
    • https://uploads.strikinglycdn.com/files/a98f11ff-448b-47bc-921a-913e698e0ee0/46069212680.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91e.bin
1e70020d4afca57986a7ff31f802d415b21d25da5bd99d26a8ae13569c43488b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 5488 bytes
font_01_sfnt_off0000eb9b.bin
f88d752dacc3cfab94a9b3f3c55a2a0185f6ed46ee701ae2ce1c1bdecef711f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10264 bytes
font_02_sfnt_off00010ec0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 4324 bytes

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