Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad7ae6a854ad617…

MALICIOUS

PDF

77.8 KB Created: 2021-02-26 22:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: abac8cee5010070fdbf2baa724e40b7a SHA-1: c507a28ed0ffedc977944e2ac17f8e7587e4da60 SHA-256: 5ad7ae6a854ad6172aa6afab4e6ee99d3875fd696f3a7b785c55921f24adc177
186 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 link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to search queries, reinforcing the lure aspect. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+is+burger+king%2527s+vegetarian+burger+made+of PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468571/normal_600ded41685a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_5fe9707068fb5.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/gavenenutekati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422390/normal_6028155fa1c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_60314d5b67d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_602d50d480268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420599/normal_60070b8e79849.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/39956799005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602c4247d48ff.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/jevedijadiki/60030721724.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/50839918503.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/39818516133.pdfIn PDF document text
    • http://fobukisa.rf.gd/how_to_find_the_side_of_a_right_angle_triangle_trigonometry.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/conjugar_verbos_en_ingles_en_pasado_continuo.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/rascals_movie_video_song_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/kutavuwovam.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/engineering_drawing_machining_symbols.pdfIn PDF document text
    • http://jiporiri.rf.gd/14445208134.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/zavavuvapi.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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5600 bytes
SHA-256: 6e6141845d19d2f78e55b8a94c91df2b2a2113d6b74ae32e7e4331099e32fad7
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10756 bytes
SHA-256: f8278b023c7986b67e9029c68f2aeb873a1e34369b56be540fb368ad867580d1

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