Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9968188254b570a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 06:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d8f6610151c741bc4007de058e670c6 SHA-1: 07dab029c0c8d3f47df68b083988845e71e8040b SHA-256: a9968188254b570a70084bbb66c8c7f2eaec0f635fefd10f1b3b484bd704bf32
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, a common tactic for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/dimosu.pdf In PDF document text
    • https://diedacorporation.net/freesiafiles/file/reduxobemanorowagigi.pdfIn PDF document text
    • http://samtekelektrik.com/files/tirovak.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109012337508570.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/38511469024.pdfIn PDF document text
    • http://eternoohydro.com/d/files/xobujapevi.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/92574842886.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d176c5c97---laremuwemudu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/1494826142.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/gekulivezotubetat.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/gijelagekewefaxofivolel.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/96290163242.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/90481180890.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/321d2bj2qjq3alimspelum0q0c/37786139240.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/84462451931.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/zusuzunarafajafijexu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/19319132039.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/38886952858.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xerasijofaloje.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/61028161164.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/buzaf.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/61880321938.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/wiruwi.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/rupudepufudagubezawavezo.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vonatifapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=custom+rom+galaxy+s7PDF 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_off0000c703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 10520 bytes
SHA-256: 23137440729ea4d569a4b2d556b55a07ac78118554705263fc0554251ca57714
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 17788 bytes
SHA-256: 7c546491c48adb94f58a46e44ea87c1d10b9c0130bcebf9d26ad260101a26348
font_02_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1