Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bffa5b4fff94ec…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 09:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53a8f3d93242dea1a9cbc756f30c8215 SHA-1: f4ac8aa9c0da70fb12468eacc486b3a04157be44 SHA-256: 22bffa5b4fff94ecc6c52f19fd74c7e9b133ec688d4bebad29856baac4962e5c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of external URIs and the nature of the link farm suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://henanshuangxin.com/d/files/46258098154.pdf In PDF document text
    • http://qlionshousing.ca/userfiles/file/tugajagebekajed.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/vatirovusemusol.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/30547477845.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109022004422712.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/zekaxobeduzakisirixeli.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd85238de3---47603855502.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/filowutigebozujunobix.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/derodixuxusilelesinitul.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/98444015866.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/kasivasanarobetipukiwip.pdfIn PDF document text
    • http://handgun.ee/media/file/33511228997.pdfIn PDF document text
    • https://tch.lu/files/files/ruditajaramog.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/divametemobebileraduler.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/xiluwubonuvavixatibozav.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/82270569601.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903154719763164.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/bozufekixufim.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/15019215835.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/xopusapukukamisaberap.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/45040054031.pdfIn PDF document text
    • http://erpos.sk/data/files/nazesigug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+excel+editor+onlinePDF 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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 16372 bytes
SHA-256: e48f94ad434c44a78f2c4bacc0bf29aa4e33e9fec1547cc1bb6693323b2b4a34
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10244 bytes
SHA-256: 22faf9bab8c9162d5732e6bb78eceb42dac8879e9e7f3ceec6dba35a495cf4ee
font_02_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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