Malicious PDF — malware analysis report

Static analysis result for SHA-256 8276fc59690c9965…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 00:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 710ce60e39ec38e39f0effa8fe602535 SHA-1: 2f90d5e75583a5d795ac0ac3e1c44c6c90a4b43a SHA-256: 8276fc59690c996590e6708ab9e55b44a5e3cd8b360b7427a4da1c38bfde47d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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=best+offline+hiking+gps+app+for+android PDF link annotation
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/topagoxitega.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/paxufijafoxo.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/noxekedowubegu.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/79116039960.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905200722.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/mezonegimavivegoku.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xedivubi.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/bumufevukebujove.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/61816615285.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/rewuvupijavejozadi.pdfIn PDF document text
    • http://brlairport.com/images/file/51113612907.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/69614123803.pdfIn PDF document text
    • http://standardamulet.com/files/files/valofuxexegoxibitofaso.pdfIn PDF document text
    • http://abnicum.com/files/file/18719018687.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/36751255164.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b6098451---353687327.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/94835470024.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/89445319151.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/19489858571.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/manilupitoturufejemukag.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/87427336578.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/66264920117.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210913151659.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/45799597238.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mawemidifoz.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/jakukujozumoxi.pdfIn PDF document text
    • 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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 10924 bytes
SHA-256: c75def9e8a0c3b3d33de864433a5a36389e6f48468e819221cd890edc21039c2
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 18448 bytes
SHA-256: 866c3a4e00542ab49294afce43cc9b4298ec38d62f6c81e4b0c196caf4506382