Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afa4afae1d054b3…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 06:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c312da9be47f3fc41dfcb0351cdd6cc5 SHA-1: b3f0a0e6bc9d6597d8973797227c14a578c8ff98 SHA-256: 5afa4afae1d054b3fac4390e8f4b627f8044105892cb64f9f91c2c38811c5587
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links to external websites. Heuristics indicate it's an image-only document designed to trick users into clicking a link, likely for credential harvesting or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=janamtip+novel+in+gujarati+pdf PDF link annotation
    • https://metrosecuritynepal.com/assets/userfiles/files/wikaguraliposikodilanu.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/21205967385.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/tagabilaboxo.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zanepovojatej.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/5684927710.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/84977596306.pdfIn PDF document text
    • http://poorclarescork.ie/images/rawubawumugomozagubuzago.pdfIn PDF document text
    • http://knipia.com/userfiles/file/50087337628.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/zilape.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/95029376723.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/surinoloruleludepafu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/74386364763.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210914171209.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/68099948253.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/dotudivefamimorale.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/zerisotumemigisoderud.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/6722999208.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/sufibaxigepujijuvaxa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/gexaxetujifugij.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/wiropiseguz.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a9bf204a---53910309597.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/bivefowisitubetorez.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/vuzotematufozapudonozibir.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_off0000b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 10960 bytes
SHA-256: f14d51e680d3ad868309e1ef9048e22def012c4cb28ea35b25c856c9fe8de15b
font_01_sfnt_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 13624 bytes
SHA-256: d9afaa132c357c7823c1d827424c44328ce31b8b7676fa342df97b0a94debf64
font_02_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1