Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c44db8814aee9…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 08:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7b2828fc133482371bcaf01b994ff08 SHA-1: 6bd724ffeb7b0503b2c08f653b922d48a66c4ed3 SHA-256: 9c9c44db8814aee90720b0f20d466488af7f380b3d800aa1d8b305ada20ea0bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://grandioso.asia/editor_upload_image/file/kapas.pdf
    • https://network-italia.com/file/61160576158.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e1737380---gumedebafelesu.pdf
    • http://duepassidalcentro.it/userfiles/files/pozudopajodusewo.pdf
    • http://dglytbt.com/upfolder/e/files/20210907172219.pdf
    • https://living-stone.lu/userfiles/files/46160503949.pdf
    • http://fotostudiovaccari.it/userfiles/files/74908544032.pdf
    • http://uniradioweb.info/userfiles/file/kezuvuwowuzojer.pdf
    • http://www.thaitofu.com/image/upload/File/nojowomimazopidano.pdf
    • http://kbchina.de/upload/12510323114.pdf
    • http://www.neoneophytou.com/ckfinder/userfiles/files/tojalilabolup.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b2e3b27f3---xadazibedumatar.pdf
    • http://beijingxinzhi.com/userfiles/file/20210901212746_209483542.pdf
    • http://4bx.pl/public/file/90487415633.pdf
    • https://noursportevents.com/wheelmarine/userfiles/file/85014160191.pdf
    • http://restravel.ru/ckfinder/userfiles/files/57643524514.pdf
    • http://cableesmaltado.com/d/files/vakezukiluxezugile.pdf
    • https://moveo-sport.pl/userfiles/file/tulip.pdf
    • http://suarezbeltran.com/aym_images/files/88515744636.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/mesosanogavapasiwobeti.pdf
    • http://cuacuonanbinh.com/userfiles/file/45152867879.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6721227753.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=halo+reach+pc+aimbot
    • 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_off0000cfaf.bin
e1bd83bf0421ce22af67b67b5dd3fb6f05f6a6499d57aaae7ab87d2ee11f7002		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 10496 bytes
font_01_sfnt_off0000e73e.bin
997ca714348eafd065e14f813b0acb15353dbe2a24ab136ea10f2d8058129415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 17268 bytes
font_02_sfnt_off00011434.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16792 bytes

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