Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ab9262882c4ec6…

MALICIOUS

PDF

67.4 KB Created: 2021-09-21 03:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b5174a3f0240c183b1f082aaa9d418e SHA-1: a4e30ebc99ffeaed9a5e2abe0f47db9855a9cf7b SHA-256: 97ab9262882c4ec669920a4e3bd12d266c139bd41dbbec1cbc8a3958c45e42f1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing or tech-support scam. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document prompts the user to call a phone number under a pretext of a financial or security issue. While no scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chpcentre.com/files/file/goxusadibuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d2e386690---juzezonefavijo.pdf
    • http://elpijisystem.com/file/45531368293.pdf
    • https://atputasbazes.lv/images/userfiles/files/67865036560.pdf
    • http://dc-8aaac82755d3.breakthroughwell.com/userfiles/files/tunazujomuxefujuve.pdf
    • https://qpshouse.com/upload/image/file/vamadona.pdf
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/bavam.pdf
    • http://myphamso1.net/uploads/files/darumipegadavelosajoxez.pdf
    • http://marmaraisg.com/images_upload/files/44592469748.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kujeder.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/watinupopefilufedokugadav.pdf
    • http://rafaelokazakov.com/file/jugalejegimuzuvufoxiv.pdf
    • https://prestinieurope.com/userfiles/files/vekojebam.pdf
    • https://dnsbp.com/all4help/fckuserfiles/file/5479829977.pdf
    • http://sjatupornservices.com/file_media/file_image/file/fijitikuretamukitobakuje.pdf
    • http://foodchemsino.com/d/files/zamapoduwijitipa.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210916193703.pdf
    • http://aquaclub.hu/userfiles/file/15550697080.pdf
    • http://guchen.ru/d/files/74387017250.pdf
    • http://thuephotocopytaihanoi.com/upload/files/kotito.pdf
    • http://joyear.com/ckfinder/userfiles/files/zikapigajexipanetebenobi.pdf
    • http://edv-denk.com/userfiles/file/zetib.pdf
    • https://taxforce.nl/userfiles/files/12585962345.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=zombies+diary+2+mod+apk
    • 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_off0000ac9d.bin
ba45f34051731152e3574adc223e94786968853a8ffe81da110ff66939f37fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9D 14296 bytes
font_01_sfnt_off0000cff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 16792 bytes
font_02_sfnt_off0000e807.bin
cc21220e26804cfbccbfbe0bf6e093d5030c1def8a5c5795a4ccf30fdbc2a964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 10736 bytes

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