Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e4b0bddf84f0bd…

MALICIOUS

PDF

121.9 KB Created: 2021-10-10 01:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2926a077c54fecfc770af395b1c7f17b SHA-1: 33a77d2f76de9feb60b8c4de47010b50daf538c5 SHA-256: a0e4b0bddf84f0bda7aa8067241ef0748ada6148250530695942cd326c5bf6a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm with numerous external URLs, many of which are hosted on disposable domains, a common tactic for phishing or malware distribution. The PDF structure and embedded URIs suggest it's designed to lure users to external sites, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=the+vampire+diaries+with+subtitles+online PDF link annotation
    • https://aromamarketing.md/img/files/93948651238.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2c759d42---83195999408.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/famozawuxadubi.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/52203375591.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/jaxojufozesudevu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/saxepavo.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/lojoxu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/8021651327.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/nikavovisifa.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/15163418970.pdfIn PDF document text
    • http://kids-ex.com/images/blog/file/34121837327.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/48287388129.pdfIn PDF document text
    • http://xn--evdebakmhizmetleri-k0c.com/uploads/file/27138772951.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/sasurojiresipajoxe.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/55654156795.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/sudegow.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/zetaxowaxiwojameveseg.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/virulasofema.pdfIn PDF document text
    • http://rs-entp.com/upload/file/sujegazij.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/34997220439.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/87636606007.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_off00017654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E66 19392 bytes
SHA-256: c02264e828adda2c6e2195c74ff53c2a5dff99954e1b0e2113b5cb1cb2336812
font_02_sfnt_off0001c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C084 11012 bytes
SHA-256: 69523bbdc8ca8908cc4b13d7659a88450bed58cd234dcfe942827618fb91b434

Open this report in the interactive analyzer, or submit your own file for analysis.