Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba84fe9450a5321d…

MALICIOUS

PDF

85.3 KB Created: 2021-01-21 00:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3ec7023c056b7343f54d208b4541e616 SHA-1: 7adf212f9e624b933f38eca74bda8b8a26afc01a SHA-256: ba84fe9450a5321dbb022decdba37d5a59ac204cf9c24111820088fe9f902e28
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a malicious redirector link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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://traffmen.ru/123?utm_term=osrs+teak+logs+price In PDF document text
    • http://baxemoge.iblogger.org/guitar_chords_chart_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/widShga/pokifajas.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/hbmYphe/talking_tom_gold_run_download_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391305/normal_60035377b9610.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/xeravoxedim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/38756461301.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/41499234766.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/adding_fractions_to_make_mixed_numbers_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/rokuvin.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_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 5192 bytes
SHA-256: d20847e3503792ff518655e5dce0007195453845d39fab7e9e02e1fb80870ef4
font_01_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 11968 bytes
SHA-256: 28c80ad7f5adb94f843a8acb1e1da93195825a526f32aeb36c6adb02727dd45d

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