Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d41f40a4dbe574…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 15:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d35c6fa638270ce4d8929ee1d648614 SHA-1: 625cce587f58ded913ea864bf5082bf540e427fc SHA-256: b7d41f40a4dbe5746fe2ec13064f18cf84bb2459ac7fae79ff50de1ec613ca9b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing attacks, designed to trick users into clicking embedded links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of distinct, potentially disposable, external links, suggesting a campaign to distribute malicious content or phish for credentials. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/na7h3obhjd8pe7itnpkdnegqhr/34137888725.pdf In PDF document text
    • http://esipro.lu/userfiles/file/lofoletujegeg.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/87040283214.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/5639251066.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210915192556.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614971b300fd8---gifukopoveselosito.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/37660586271.pdfIn PDF document text
    • http://ymmicro.com/files/files/85238707412.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/91853992909.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/bomidumepazoxubidek.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/73136409464.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/xawutabomevulu.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/10239861321.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/kazipuwo.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/18744222656.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/86150107757.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/48604958907.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/25901091461.pdfIn PDF document text
    • http://erpos.sk/data/files/24136398482.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/14527154343.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/navirasiwun.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69386040837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fight+for+my+way+123moviesPDF link annotation
    • 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_off0000abd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD6 11100 bytes
SHA-256: 92f6ef572e9761d6ba2951f3dea13a7c0dff1996a9f720be5a8fafc40693c1fc
font_01_sfnt_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 14292 bytes
SHA-256: e5f109ae45e91d459cc0c49645b27742855f747e895c4e8442b463feeba181d8
font_02_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1