Malicious PDF — malware analysis report

Static analysis result for SHA-256 388ef7246a67dd13…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 04:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e5d1044723acde503a6efabd6c491d7 SHA-1: 12e16c1b4f316e6b08b1838c5eb68ad45fd3cf79 SHA-256: 388ef7246a67dd13b6f9cb63b4fc836e658215e11ee0fc6694d451a280cfe021
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to solicit sensitive information such as private keys or backup codes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://irlanc.ru/uplcv?utm_term=android+openvpn+setup PDF link annotation
    • http://www.fuchingrading.com/upload/file/38657888131.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sopitugawovamep.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/jojawexi.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/tekanaxez.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/42912730403.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/37235981356.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/15861571806.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/85833525184.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/9645197816.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/jasareseduvovuxabazonup.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/18635657040.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/42594077938.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/moxuturibididuroma.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/pabejasiwujogo.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/lezagu.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/51441219568.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/73062375559.pdfIn PDF document text
    • https://botroul.be/uploads/29113818129.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tezixonakarozazidiga.pdfIn PDF document text
    • http://robbes.nl/media/files/podevejoreserifomuxajenu.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/21318412858.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kavivusutoxavoditapofet.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/46084108358.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/93230717881.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339f211fd11---43117359139.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/86271095987.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17348 bytes
SHA-256: 82668751d7645506cbfeca2cc0de62dedd955c7b9f23be60faa0ab66c8c553b7
font_02_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 10324 bytes
SHA-256: 994b4b37d561694178eff99dce7b1e93bf50bbfeb60adc2d41bd7d3caddba89f