Malicious PDF — malware analysis report

Static analysis result for SHA-256 88081268a91203ca…

MALICIOUS

PDF

70.9 KB Created: 2021-09-22 22:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 769977e48d1ac0d0cd2fa87e9f8be20f SHA-1: 1e8a8811915db6d0dc6e9c8dae9930b8937eec65 SHA-256: 88081268a91203cab63b56e1704674f26c4297dd741eab1083c03388f5176938
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, supporting the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=popular+bloxburg+houses
    • https://linkevicius.com/upload/galery/file/zaxunakilegutokixewusiz.pdf
    • http://skpizzasubs.com/uploads/files/55512647302.pdf
    • https://bunianco.com/other_files/File/39286910483.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/xakegavujekuxewoso.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/17138315821.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zadof.pdf
    • http://altaprecision.com/userfiles/file/nesixagulukitefew.pdf
    • https://seikai.jp/free_images/files/zirolovorugatofexipimebu.pdf
    • http://tycoonmedical.com/userfiles/file/55776706737.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909202953.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210923_025257.pdf
    • https://basundharamart.com/userfiles/file/1616703352.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/rojejiwo.pdf
    • http://ventmetal.ru/userfiles/files/51946195575.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/13231667175.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/41870481894.pdf
    • https://fotofidelity.cz/userfiles/file/90337345662.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/15865618760.pdf
    • https://ikomsolutions.com/admin/userfiles/file/kumiwazepit.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/20007828788.pdf
    • http://kfoodntea.com/dataroom/file/zinosizimujexijebavulatog.pdf
    • http://imi.vc/upload/files/42411480724.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5de.bin
3b93a3e7b60993556f0a5efef9b01946ff76de7792e73aa5da9cf9e7204bb0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 15768 bytes
font_01_sfnt_off0000de53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 16792 bytes
font_02_sfnt_off0000f66a.bin
61eb8d342567d8f6eadfd26f6dc711c688e7bc9c63372261520af0dcfcb37254		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 10580 bytes

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