Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f26f6feccb2f8e…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 05:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ea9beaac086f6ead413998fffbe8fd9 SHA-1: 2bd8fbd708deb624a8ad0866faa90bb8b865c404 SHA-256: c9f26f6feccb2f8edcbde5541991a56544e3af9a0d5e0e2566fdf38d1bcb1134
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=ccloud+tv+guide+not+working
    • http://diwokaxojizo.iblogger.org/5892799774.pdf
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/9157859.pdf
    • http://jupowawixiz.iblogger.org/pezipubemizadop.pdf
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/7098788.pdf
    • https://xisagoruno.weebly.com/uploads/1/3/5/3/135332800/5548268.pdf
    • https://cdn.sqhk.co/gujurolekuma/dQjfUgi/tigimumu.pdf
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/6010088.pdf
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/de124f9.pdf
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/e536c76.pdf
    • https://cdn.sqhk.co/zekafomaze/XbiaheY/murevon.pdf
    • https://cdn.sqhk.co/molipigi/ejc6hbl/20737780682.pdf
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/4098451.pdf
    • https://wujojebexubab.weebly.com/uploads/1/3/1/3/131380870/zosizutinujuvoze.pdf
    • http://zadokutasige.22web.org/vamujisufi.pdf
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/7144484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://setavafajo.epizy.com/cysteamine_melasma.pdf
    • http://muferipimakolop.rf.gd/rv_refrigerator_troubleshooting_guide.pdf
    • http://dasutako.rf.gd/73513514079.pdf
    • http://seriwod.epizy.com/anhidrido_sulfuroso_como_se_forma.pdf
    • http://fafinonez.rf.gd/judakekujifodige.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89e.bin
2ec2d87dcfccb9255035c492bd05ef287190a9fa83959f0a937a2be9c696decb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 4840 bytes
font_01_sfnt_off0000f933.bin
966b6e02d257759e70ae92c459ffa13236b57df41d85ef0ecfaa196348181a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10148 bytes
font_02_sfnt_off00011bf4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 4324 bytes

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