Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca716c37a3ee8e5f…

MALICIOUS

PDF

67.9 KB Created: 2020-12-14 19:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bed4ccd3e91aba4db6f9d5aa2c4ab71c SHA-1: 183cb46024fdec21645c1da0cdadf17b859902ce SHA-256: ca716c37a3ee8e5fc23d4bd6a6ef46e5f95ffd908b0c4c4f0b0a20af24559cba
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user consumption but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://ggtraff.ru/123?utm_term=minimum+wage+mythbusters
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/7284329.pdf
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/warotiw.pdf
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/neruwakoju.pdf
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/nozofuzefegina-wokexejoxame-xotutekizuza.pdf
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/fefuz_bojofatotos.pdf
    • https://bojurejid.weebly.com/uploads/1/3/4/8/134887271/e792f37a28b5ce.pdf
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/feluzoxusuta-faginabavulow-rekegivi-demiloboxikuxu.pdf
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/7654535.pdf
    • https://rarasaxemog.weebly.com/uploads/1/3/4/6/134611000/pazumesa_tebasi_nikajefepe_berevabusufub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/320b9a1b-6029-4fef-8843-3cc09acab212/19441562016.pdf
    • https://s3.amazonaws.com/sesafefanulokam/list_of_arcs_for_hunter_x_hunter.pdf
    • https://s3.amazonaws.com/tofizo/simon_biology_the_core.pdf
    • https://static1.squarespace.com/static/5fc6f13b02915d4a16f575cb/t/5fcc6ee683d2ac65cc0b6a27/1607233254350/nejotu.pdf
    • https://uploads.strikinglycdn.com/files/72965992-5583-41bd-812e-6e92e8f66973/biology_chapter_16_assessment_answers_quizlet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd28.bin
3bd1e5892ce9c4fe1becd7d216f7146eb69ade612f0fb53124b7b96d0f3dce7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 5404 bytes
font_01_sfnt_off0000df84.bin
423a21c7451a4c3d1738cdd1a5ab7f45f063338a3d0117afe60d785975b428df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10428 bytes

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