Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85efadf415edcfd…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 16:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acd35d813b2cbd89a2a7a95b83633c4b SHA-1: ff599e0c48d85244120e5f5f0a92ca86fa3eef81 SHA-256: a85efadf415edcfd7b15466adf5c32c064732387e583df09b02fd76b5ea15357
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 and image-only content, designed to trick users into clicking an embedded link. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of distinct hosts, suggesting a broad phishing campaign. While no scripts were directly extracted, the nature of the PDF and the presence of numerous unknown URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://a-pluset.com/userfiles/kujudesidijesebafubi.pdf In PDF document text
    • https://appvid.eus/userfiles/files/duzop.pdfIn PDF document text
    • https://egca.fr/userfiles/file/jopimojupozisezerenot.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/dawesesivif.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/8503985524.pdfIn PDF document text
    • http://renknh.com/ckupload/files/gowudogubogatezojas.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/nasozakewowufi.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/jesofu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/11850608580.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140764401b15---sekafejamowaf.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/70712716315.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/65235905387.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/8249019331.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/fepimorel.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/topikurajoraveled.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/filirowil.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109051925537291.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/woselututu.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/6781245163.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/niloronogokod.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/93394956303.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/45428251215.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/11856714192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chemical+formula+for+alcoholPDF 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_off0000b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB112 10364 bytes
SHA-256: f69ba9d22b1b115efee848abcc05fd58274e228d2f26bfdfb2aa21e60edbbfb7
font_01_sfnt_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 13884 bytes
SHA-256: 4014f82fe4b12987d921429ac47d6ca7e5234b362c685dec87184a40d9a4cc52