Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1e6170e5574df8…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 07:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebd945aee30610fcf0ac2b3bb477b8c6 SHA-1: ca9e954e32d08119fef59ef16fe75bf21e9a3bc6 SHA-256: bc1e6170e5574df8bfec31525c78c62e5fbb16237c70a243515e5ff9d183dc24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=pp+ss+pp+gold PDF link annotation
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/52724961585.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/15971457771.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/turizigex.pdfIn PDF document text
    • http://premo.at/userfiles/file/42647248051.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/wavoxizanegojas.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jaxijaturewemogas.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/29497564466.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/bofulekipemame.pdfIn PDF document text
    • https://renewone.de/files/kumoredukekitut.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bununabadized.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wudosirawogofo.pdfIn PDF document text
    • http://surausa.com/uploads/files/42890585080.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/perisiwukonujovikufo.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/sorigofod.pdfIn PDF document text
    • http://pasted-radio.de/web/files/86160924535.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/95236999303.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/rupovilademupajowe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c79ee73e567c527dfa665faa762fa2b3/linolijujovadeja.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/48758899646.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/82980197781.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/40646984605.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/fewigisu.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/23980215500.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/96523978213.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614201be77256---sixofosuwik.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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 9880 bytes
SHA-256: 647258444824e57dafb0c6fdc95d58a3400d66b63aa0bb1f571b8d06f1475620
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 17024 bytes
SHA-256: 6443e4165980f8d72ec772f67aa7803b9140ba503ce4142c27f063d79c8ab5e1

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