Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ddecff9894232d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 21:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f02ecad3573d33a752df97737580ec5 SHA-1: 6372d4587699c3fe9a7c68daa013895714e49a4c SHA-256: a0ddecff9894232d6d04d1f240f5bd2050a44f3c4a5d1e8421b54a963ef25f68
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam pattern, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to deceive users into contacting fraudulent support.

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 http://tele-klass.ru/i/upload/files/gafub.pdf In PDF document text
    • http://wangguanhardware.com/userfiles/file/vejowusenupekomul.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/96120202145.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/mugafesirageti.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/45938205566.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/wudotodo.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/70960695063.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210903073756.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1084bptqoghcgsa2c9ahfc4926/6667682961.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/fovuvam.pdfIn PDF document text
    • http://gibisch.org/files/files/83087535522.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/40510333900.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/36691888935.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc4671445c---vosigeguradevafejop.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/94684723420.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/nosiritowibewibow.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/28476746863.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/guson.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/53112628838.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/periga.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/vaxexoporuguz.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/deregoligizi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/69267238329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+ballad+of+gay+tony+cheats+pcPDF 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_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 18036 bytes
SHA-256: 6ef31fe78093382d4f3dbdd2144228f1d422ce58fe5f2c31f8cade5d75058186
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10924 bytes
SHA-256: 764d11fc782d62af84df687547b8a4403cefeb20987f43f22d178d74269d81af
font_02_sfnt_off0001245f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1