Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faf8ba3fff64983…

MALICIOUS

PDF

62.1 KB Created: 2021-02-22 03:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 98d5a83097b9ae1ec05c1c25b6903c26 SHA-1: 256f99f72a0491571a07e55a893eb841aa75c7af SHA-256: 1faf8ba3fff64983c005daa50cef242fe573740aaabecf249c274f5613593fff
216 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including brand impersonation for credential phishing and a large number of external links, suggesting a link farm. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves impersonating Instagram to trick users into clicking a link that leads to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/redukegowo_panopijuwetun.pdf.
  • 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=usa+test+prep+biology+answer+key+quizlet PDF link annotation
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/redukegowo_panopijuwetun.pdfIn PDF document text
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/defemefagij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_6005da1335d6c.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/wukufu_vobivijimaked.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/da517898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_602c4ba768c94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389074/normal_5fc90975dbdbb.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/gituvolosojemu-fewusa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366022/normal_600964b014f96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff95527f1128.pdfIn PDF document text
    • https://libirobu.weebly.com/uploads/1/3/5/3/135336219/sedonifubimamavezifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugudilun.epizy.com/odepc_online_registration_form_for_nurses.pdfIn PDF document text
    • http://niworojuxine.rf.gd/oceans_11_parents_guide.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB690 5552 bytes
SHA-256: 6d6562ad70b2950e902c7a981fa16336e290a97f72afc897e6290661b1430ad2
font_01_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 9956 bytes
SHA-256: c6cad74d0a544115938a26523bc4a847afad7e1ea41bc5cae141122898971102

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