Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4f02921fe53f14…

MALICIOUS

PDF

104.5 KB Created: 2021-09-20 01:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7899cd762bd42dbecf91a6e8c51e1633 SHA-1: c25f5f7aeef5935c62930163ab5bd72072466d33 SHA-256: ff4f02921fe53f1423af7d326a11591090f2abef896ad2c23eda00163bda58b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and also by an ML classifier. It contains embedded JavaScript and multiple external URIs, suggesting it is designed to redirect users to malicious sites or download additional payloads. The heuristic 'SE_CALLBACK_LURE' indicates the document may also be attempting to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=%E1%BB%A9ng+d%E1%BB%A5ng+%C4%91%E1%BB%8Dc+truy%E1%BB%87n+tranh+offline+tr%C3%AAn+android PDF link annotation
    • http://alrehabourhome.com/userfiles/files/8347937017.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/2276138685.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fejorolabokaxixozomidesum.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/71709835703.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/midadidesinojarukijazab.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/xipejivewijatevurumusa.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vukoxabikakefitunozikev.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/xejomitewimizapanopo.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tukeves.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e5e0934552394fd24ba5e72aa1e07474/909495479.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/51454831403.pdfIn PDF document text
    • http://etkenkalip.com/files/43977286830.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/44767933398.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/44979701956.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/tixunosu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/89906468171.pdfIn PDF document text
    • https://ubranni.com/uploader/files/28854809211.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/98223523000.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/36879459986.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/98175459123.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/dudujugefomiko.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/sujezegikivagunepafezek.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/85158420535.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zivogelolonaxemaraxiwab.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011c54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C54 31292 bytes
SHA-256: 63410bd1317771f7d6f5e06b7eeaa47b965a6339082eeef9514dadb91698702c
font_00_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 11740 bytes
SHA-256: 9bf082371821faec46111edb9024893c603172646518678c0620effa60268089
font_02_sfnt_off000159f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17203 16296 bytes
SHA-256: 0386a1c13e6e24afeae3a6e9ab8ec32f3cbcd5598a0e2bd3099080bd2aaca191
font_04_sfnt_off000187f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F5 1796 bytes
SHA-256: 755b843c3a20f66ea68988c6c55ef5c5be5f59bb004e03bff28a6134c7f942e8

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