Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb3461920acec94…

MALICIOUS

PDF

166.3 KB Created: 2021-10-05 15:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 442922c9fe7066aa90b8c456467f9ee6 SHA-1: a70720fdae2c229f735fb9ce6ad6a12e69241364 SHA-256: 5eb3461920acec94247951c372ea6521cfac0fa90cc8e32adaba633adf4af5f1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a critical heuristic firing from ML classification, and ClamAV detection indicates malicious content. The embedded JavaScript likely redirects the user to external URLs, such as 'https://drafthe.ru/uplcv?utm_term=being+dramatic+meaning', which is part of a link farm hosting numerous PDF files. This suggests the document is intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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.
  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=being+dramatic+meaning PDF link annotation
    • http://flairpens.ru/uploads/files/58320403787.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/sobalaze.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/87079271875.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/36127905569.pdfIn PDF document text
    • https://tomas-music.com/contents/files/tifebox.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8e98b4b108ff421331eee6443c8e600a/xujaximevevitopixakejod.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/tudoxewudedepurumakuzar.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/13353815447.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/kogis.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/89958639903.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/todaviwibatejoxen.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/joxofak.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/maluwopunozemivererinu.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/32690456166.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/72844207487.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/36222957206.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/jenukujewenasomiv.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/zajef.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/26201348788.pdfIn PDF document text
    • http://ucokampen.com/media/files/6086842427.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/11552776697.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/jadoxikotewajaroleliki.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/tabavibawiwudejefitilijum.pdfIn PDF document text
    • http://kotolantopeni.cz/file/62584976461.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/38836750593.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/maxezuzudavi.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/gixetikivan.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_off00022633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22633 10432 bytes
SHA-256: 552e67d3dd8124beb006e74046a2bd98b15778000a97843dba696061a5fd4c36
font_01_sfnt_off00023da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DA0 21144 bytes
SHA-256: af0584a2c4177d2c51f83af46d8100f1e1d1f369bbe90a16cf5eb14d77a02d1f
font_02_sfnt_off00027359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1