Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfbabd3e7b25fa7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 00:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd5a63fe477a34cfffa1be630d182cd4 SHA-1: 67575b3dc98c0569a078b8cde91d15ea342e8a65 SHA-256: fbfbabd3e7b25fa7304ab19e1297ae165c1b00cd164a0abc9b4ee76d563436db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URLs, indicating an attempt to redirect users to malicious sites. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext. ClamAV detection and ML classification confirm its malicious nature, likely serving as a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=cell+phone+spy+app+for+android
    • https://megatex.ua/images/uploads/file/75443126853.pdf
    • https://quatcongnghieput.com/uploads/files/neguzaza.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a859a9bc0---13115420049.pdf
    • http://soupworld.de/upload/file/47609868460.pdf
    • http://ukonlinedirect.com/userfiles/files/jagixivas.pdf
    • http://atya.eu/files/file/68937516606.pdf
    • https://novamakine.com/upload/ckfinder/files/vujuzuv.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6731ab0e3---fobimidino.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/rufubarupak.pdf
    • https://successalpha.team/upload/files/15407415417.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/mutavubez.pdf
    • http://accapierre.it/userfiles/files/20787654561.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/64959070553.pdf
    • https://tumsad.org/img/editor/image/file/biwavivemutigatu.pdf
    • https://spacio.hk/attachment/file/11982919922.pdf
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/tafodizexuk.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/56910022975.pdf
    • http://technoauto.jp/js/upload/files/valovo.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/99233838247.pdf
    • https://shevtsov-art.com/uploads/files/kikizadozejamepajeduso.pdf
    • https://pecintajp.com/contents/files/85311558668.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_off0000df02.bin
eb4a31568041594a2387040fdda7378e2201179fcd3e0fd8a33ec6a0b9bae416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 10644 bytes
font_01_sfnt_off0000f752.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 16792 bytes
font_02_sfnt_off00010f64.bin
38dbb72c468c68051b46db91e66374f2fc4f404e843d8d5cc6545be0696df8b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 18388 bytes

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