Malicious PDF — malware analysis report

Static analysis result for SHA-256 35eff6a8cef6ec10…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 13:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2253856dac64e3b13f56971827c1bf85 SHA-1: 0e25b67520f24b358f116e6be2779a466e608438 SHA-256: 35eff6a8cef6ec10359b7f5e22a3d90080cb7e4b0e1f158c409afe9e6c9cb772
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or IP addresses, suggesting a link farm or redirection mechanism for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=paddington+qld+post+code PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/4098271770.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sojajusosimotane.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/56693661894.pdfPDF link annotation
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vedokiligirafaledojiged.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/71621806121.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/64795769763.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/tixudoxoxuwonupemuj.pdfIn PDF document text
    • http://pk.mo/userfiles/file/dubebanoluvefaxe.pdfIn PDF document text
    • https://dcimx.com/files/tamubunixipenoguf.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/27586133453.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/8286113467.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/pidapudevumapumubagizut.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nibirorigosomizadadagilev.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a7c4a01---tomuxidatalatudibu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9f5a3cf2---15811123875.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/tezowefufudido.pdfIn PDF document text
    • https://laser123.com/geektic/files/90753451210.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/62936843881.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/45666219049.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/13034628029.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/59479420945.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/nikidelazasenisoxupav.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_off0000bed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 18556 bytes
SHA-256: 0604292ac20aa4d19a63d17c47ec6d60490c9b793e9621b7825c828315a820cc
font_02_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 10736 bytes
SHA-256: 296b442c833db6d4a0cdfaa244b4f3fb088ebee4600dcbba48011a5c3408511b