Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3495faba908e250…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 387c66324c58b037699b5fc0432b1322 SHA-1: 55f882dcc0d5b74721c41166d12a227128c1abb6 SHA-256: f3495faba908e25074d89cde60b5c1207aa7cfee747041689b04084be78d2dd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being used for phishing or malware distribution. No scripts were extracted, but the structure and heuristics strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://www.southdownscellars.co.uk/ckfinder/userfiles/files/54533899931.pdf In PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/39635357255.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/63631251214.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/79882162852.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/narumenadilaseged.pdfIn PDF document text
    • http://archbot.pl/files/file/39339139295.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/rivixi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/valadonilapax.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///lonosejulom.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/nadinopiba.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/81444248393.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/618767558.pdfIn PDF document text
    • https://andhimazhai.com/images/files/6766432181.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/53483313007.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/bozipepamiloxatulipef.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/69194941023.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/rosiwebubabebuva.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/e9dvfst61mncd9t11kka9617je/zalolodepip.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/89002229174.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/sijexijidisuforawijanatuf.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/11449958619.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/81243641894.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/wuvuli.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/29876141124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=io+games+like+fall+guysPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 15352 bytes
SHA-256: 129aeaca083944fc05c2c8f5ed94328f38f40e221f7ff0a7144b0ba94ef588ed
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10512 bytes
SHA-256: 7e3493540e7a2e5329d490d3aeb5886da7ec700c2a47a26caa5c5934df1eed64

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