Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb85bcf3b014509…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7403fec1ceaf60ce44cbd943182fa1ad SHA-1: 3122665da3804f57c5134338b8a88ebc028bb4ec SHA-256: 9bb85bcf3b014509c1311d3c9a71465d32167861e59167893818f272eea8217d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous external links, with many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic further suggests a potential callback phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://beeshark.ro/app/webroot/files/userfiles/files/25747857414.pdf
    • http://eatatrudy.com/uploads/files/97404477401.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613101728a719---tiragaturefawunajumif.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pojibetewisovokutam.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/60511431157.pdf
    • https://kuzeyilac.com/resimler/files/67483343847.pdf
    • http://fanghsin.com/uploads/files/202109100017496277.pdf
    • https://akvaguru.hu/user/file/jovejuwuvag.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/lawokedazusasato.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6d796c3a---83181825994.pdf
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tapupovokidas.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/19746587161.pdf
    • http://pwmtqatar.net/userfiles/file/81372824234.pdf
    • https://n-tlg.com/files/file/pamix.pdf
    • https://cevhertemizlik.com/userfiles/files/jutotisune.pdf
    • https://psfund.org/public/uploads/files/cms_files/42315121646.pdf
    • http://freeski.hu/freeski/file/41076952924.pdf
    • http://www.zywawiara.pl/pliki/satavitirudefewi.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/78323381331.pdf
    • https://chinese-wall.tw/upload/files/76493913443.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/daxajigateler.pdf
    • http://wronba.com/uploads/wysiwyg/file/fosupezaxenoxuwevi.pdf
    • http://julianina.dk/upload/file/62674330186.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+policeman+full+book+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_off0000d793.bin
b7928ea5531922969623ed83607dec31d52044800924905e425ca883530251d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 10856 bytes
font_01_sfnt_off0000f061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16792 bytes
font_02_sfnt_off00010873.bin
a4f5a4e5062625be3dd51d231487668616770479b655b406ea8efc22b98e564f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 18192 bytes

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