Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e03d0c4a7c9223…

MALICIOUS

PDF

81.4 KB Created: 2021-10-05 05:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5f543aa5a77ad7c7b815759221e487b SHA-1: 508bf6ff4902011171a8bd40b73f3883e38130d9 SHA-256: 74e03d0c4a7c9223c15f3773d38ae82fb9d8ff8801e6aa842b4237f4fcdfb994
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous embedded URLs, many pointing to potentially disposable or unknown hosts, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2c340405---daruzuzuso.pdf In PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/66395643570.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/17461582828.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614823cb55220---jiridalulosavadeduwu.pdfIn PDF document text
    • https://atiksigorta.com/files/pojetesavevojasiguxokif.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/zeket.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/62023582000.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/2806048285.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pirafegaresisojekar.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/bitixoma.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///fovedizamulav.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/81693635514.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/govejuvixabozixojeledi.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/zesekawiv.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/todovigaw.pdfIn PDF document text
    • http://ministerium.pt/files/jinatolebawaxofavatajol.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/99543025216.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109181800322042.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/85113266777.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/84982514145.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/24452985375.pdfIn PDF document text
    • https://pcetravel.com/files/file/gatixujabiwedisunalipifu.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916181210438120.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/94151531444.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/jepejinorisepozubewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kings+and+queens+of+england+timelinePDF 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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 17484 bytes
SHA-256: 69ab6bbc650d8a0adce19b4615e925aa06bbbde0a4d7faccab5da7c10f2a7a08
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10832 bytes
SHA-256: af0e4a1116607b76e9fcc0254d757409f91001d35d942bdb939201164f6e2736
font_02_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1