Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8aaabaaabae262c…

MALICIOUS

PDF

82.2 KB Created: 2021-10-14 08:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 012d51f9a77c01ecbb5c1608d7b23ebe SHA-1: b63ed29565d6112b642cb4b99c63dab0c6804e33 SHA-256: f8aaabaaabae262ce7a70a5b5f89c88194d25f17b00848a598451dbe31381767
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=foundering+meaning+horse PDF link annotation
    • http://willajarmar.pl/userfiles/file/59903660821.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/tipokuwu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901153756.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/gidigatoletapevalimowe.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/sejirokizile.pdfIn PDF document text
    • https://pecintajp.com/contents/files/zujivujepezal.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/duzagaziv.pdfIn PDF document text
    • https://efnnma.org/files/file/sukoxupamokagawu.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/masodax.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/gugololivudu.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/79271996281.pdfIn PDF document text
    • http://centronegozi.com/public/14618708615.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/nipoxadulumozomisepuj.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/jogufibafoximatesupelalu.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/95334378513.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/71102330715.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/57887229929.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/bupedikujawu.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/77894334970.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/ruwab.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/15924128909.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/besuladoxarofilalefus.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/senuribasowepazoxesuvokex.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/7219472714.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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 10628 bytes
SHA-256: b7fd97b842a7343a7f11f1223d371969b2a5d8907a4d6ac6b97b56ac80d05d4b
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 17800 bytes
SHA-256: 0cbcc38b204926a87c214078be75b315c0b711806e9c8ce7df886cbd7df09cc5
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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