Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba4e2149795c815…

MALICIOUS

PDF

79.1 KB Created: 2021-01-11 18:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 793fb851ff19467689cfb8d38e1e5b1f SHA-1: e8942b34b909791f8078a29c625ccd6cec36ef8c SHA-256: 1ba4e2149795c81526242c40b8fea9056a7f291a632b04bf0d6b96907be934fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=free+editable+bookmark+template+word PDF link annotation
    • https://site-1177067.mozfiles.com/files/1177067/83752859375.pdfIn PDF document text
    • https://site-1173734.mozfiles.com/files/1173734/boo_at_the_zoo.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/wuliruvujo.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/jgKVTZP/bibogefakexagexajaxerafol.pdfIn PDF document text
    • https://site-1178304.mozfiles.com/files/1178304/pituzofesagepogetorejixud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f9556a2383fa.pdfIn PDF document text
    • https://site-1172347.mozfiles.com/files/1172347/65822750320.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/kiguvuguxopovaku.pdfIn PDF document text
    • https://tuvajidemagik.weebly.com/uploads/1/3/2/6/132681445/7649210.pdfIn PDF document text
    • https://site-1173463.mozfiles.com/files/1173463/580072258.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/Njh7gjD/59208773813.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wujanozo/hauteur_d_un_triangle_quelconque_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/2614893322.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 4860 bytes
SHA-256: 6f51dc363be8bd3cbbeee8bbb4b910a239ea7ff0b612be5c37b6b59f66945715
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 11052 bytes
SHA-256: c45000e1525067e8b83d09c1929f6c88c97391dfac21176ec7305532317c003f
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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