Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a7e3b66343c49f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 16:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34f432c56ca70dbc78455655e53676f4 SHA-1: df2e2bd6e038a3f3c8020bab592ba6ee5f938c49 SHA-256: f9a7e3b66343c49f356806fbef5df3777440c1f841baffb0720e30c9da697b10
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam pretext, aiming to trick users into calling a fraudulent number. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://biosystech.com/pdsFck/file/ferajiligasujimobolete.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/wedez.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/gitawesegegukubugovesav.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/tiwitiru.pdf
    • http://miass.realxenon.ru/uploads/files/40574638370.pdf
    • http://gz-chengeng.com/uploadfile/files/tafobotumeveku.pdf
    • http://jeykrishnaclub.com/images/file/vabebowikilav.pdf
    • http://czyxchem.com/upload/files/53071939777.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/25568473338.pdf
    • http://fecirturizm.com/resimler/files/95687547281.pdf
    • https://virtualpulse.eu/UserFiles/file/vafifexaguxidozepi.pdf
    • http://standardamulet.com/files/files/lutuverunewagad.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/13103139363.pdf
    • http://reckdance.pl/userfiles/file/rozenisisilasovufu.pdf
    • http://portamarioarchitetto.eu/userfiles/files/kitemizogimosad.pdf
    • https://aaaxxion.info/images/file/lirufitu.pdf
    • http://escuelasfutbol8.com/docs/files/sulosalunukazap.pdf
    • http://deeringbayrealestate.com/userfiles/files/zevovowowisilusewevat.pdf
    • https://bepcongnghiepphuchung.vn/userfiles/file/46218943509.pdf
    • http://autowagon.it/userfiles/files/ruwuvufizezajaxew.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/jizavafosupozirefikavugug.pdf
    • http://exima.kr/userData/board/file/butiwedi.pdf
    • https://siam-royal-view.ru/data/files/wekiduzus.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/eb2e6af967d618acb0606bf7ed39bb65/24867159022.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=change+camera+app+android
    • 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_off0000d29b.bin
63319bb87a4ae57d06b211739e1b2e6462a977545fe98de68acdff982d67b796		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 10680 bytes
font_01_sfnt_off0000ea99.bin
20283008850e635c385899386b03bd08409323fd8fd77faab1d603778ee8355e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 16964 bytes
font_02_sfnt_off00011682.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 16792 bytes

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