Malicious PDF — malware analysis report

Static analysis result for SHA-256 343158046cd72d16…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 03:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0fd5893e25c242af68ea2914d3681b3 SHA-1: 0184cb6a0364a9d873b77ca373306a1d3acadb25 SHA-256: 343158046cd72d1654d91e9853b4b69d3456cb038ab77935fa24687c1fd6d607
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. One prominent URL, 'https://allytemp.ru/uplcv?utm_term=secure+vpn+download+for+android', suggests a lure for downloading VPN software, a common tactic in phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=secure+vpn+download+for+android PDF link annotation
    • https://mygoaltv.org/ipp/images/uploads/files/wironajujemobi.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/8566739403.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/19912769260.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/batijukarugudubizu.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/37370276287.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisoko.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/remojuxet.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mebilifuparorew.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/sorujizulowisuxi.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/41932170990.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/xojigesozuzegifagibixop.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090223034137.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/16073045180.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/gipovejazunawe.pdfIn PDF document text
    • https://31app.com/userfiles/file/kesuguwubalofanofeliru.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sabaxerawofogotalibe.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109021219219626.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050530074245.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16311395031143.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/90203313898.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161399cc4b4c9d---4256570267.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/52b55c5cc9b55621b156cbd77f3f5a09/jewiwemonufilutolawama.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/67371078021.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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 10672 bytes
SHA-256: b8e0ae2b472270c28dde076cbfa99925fac65386aa049b6f9985a845c00f15a1
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 20232 bytes
SHA-256: b763ebe489caaf0d3e21c7910d4efff1f1dd574d8cdea50f4f3ae56296ef3ea1