Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa78d68b5913a015…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 01:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0de5c59114f7a55d94b30b96fec3ebaf SHA-1: 5c76081c7006df15835f7a22dae391f507e3085a SHA-256: aa78d68b5913a0153e863161f571408adef116cd63b0a443611fee92a9a17139
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://alaqart.atelierleuthold.ch/userfiles/files/bafamuzagovalasubapuloxuv.pdf In PDF document text
    • http://paramountswimwear.com/userfiles/files/46807198680.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913063339988896.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/jugejofuzejopuf.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/16482149275.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/tawekoliza.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091104163473499.pdfIn PDF document text
    • https://webaprint.be/img/file/zalizuxejeverajeli.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_F797203138959A44.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161310387bf96b---denagunivuvolofakunazum.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/49779351439.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/puzilaf.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135756b2e9bc---nazasinafo.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/55730358472.pdfIn PDF document text
    • http://intertravel.hu/_user/file/sovowelitulesaxakupo.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/vumodozopi.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/dokofosudasusuwatewevux.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/xiputebejofi.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/21277481696.pdfIn PDF document text
    • https://cet.sk/res/file/62028388145.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/57863443588.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/detitel.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/bijepivasibox.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/14565102206.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/44340369669.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/32810895185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+no+pc+pelo+pen+drivePDF 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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 18140 bytes
SHA-256: 380e16ca8a39fb8a62bed3870318ab2a31f576f4231c2e99427cdfa190a35afe
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 10124 bytes
SHA-256: 5c3bd841ec0ee76bcc95decd9acff7665b4d0bf6008d5d8de947ede7645e7a0f
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1