Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffb205e491db027…

MALICIOUS

PDF

71.6 KB Created: 2021-10-11 03:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 138ca119db5214c39a71dbe400a4814e SHA-1: 2c66856876e95d58444427b1ee81b7376b199176 SHA-256: fffb205e491db027acbf421e985e57cd7d6afa307fb13f3732a0b8a0ccd589c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of these URLs suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=what+not+to+feed+red+wigglers PDF link annotation
    • http://maurovalleferroarchitetto.eu/userfiles/files/36698721829.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/muserizigefinezosevodag.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/19505471554.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210915_170156.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sonidixawegedusufugamedu.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210906215446.pdfIn PDF document text
    • http://honda-vo.com/upload/file/juzaziridosati.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/magonerez.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/9c9934ac24894f543e63ef90a932fe11.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/49733541999.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/pazojexor.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/sujovofegutuz.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/88304136340.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/gedivup.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/14874466084.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/86821680205.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/97893212842.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/17423392123.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/55537673589.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/basibukasegiwapetaxeji.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/47318121687.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://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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 16228 bytes
SHA-256: 5c18dbe620fc72f8f30789000aa3b70320f78056a6c870de75b6f12c9970f94c
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10712 bytes
SHA-256: a386e245bee581c1ce8800c3da7f0d9d0689e496abdba49b7911a7bccd953902

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