Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0aa216ab4399e78…

MALICIOUS

PDF

80.6 KB Created: 2021-04-10 19:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3e5faee9764424e49aebc1173e84634c SHA-1: ea5ffdb3f53a9f1d4693920df0a0c18fff320fe5 SHA-256: d0aa216ab4399e787f2a1269a6a8709e0bd68e5050da6390a7eda8813b22ee99
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on cloud storage services, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, with one pointing to 'https://baarspo.ru/strik?utm_term=osi+model+real+world+example'. This indicates a likely attempt to drive traffic to malicious or spam sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/strik?utm_term=osi+model+real+world+example PDF link annotation
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://tozilamuvopodes.weebly.com/uploads/1/3/5/9/135966944/31b60ae.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/2321a189e7028a.pdfIn PDF document text
    • http://simomezubuxo.22web.org/does_apple_replace_beats_ear_pads.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/gfbjca0/dezanesuz.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/da60b2a36c.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/bizamesuwepe/xovururovitukubumosadaje.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/dasagezizojumajodanu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/bhabhipedia_full_movie_filmywap.pdfIn PDF document text
    • http://fexojuvaf.rf.gd/nuzolatalirorujox.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/will_there_be_another_book_in_the_divergent_series.pdfIn PDF document text
    • http://kufitorafusi.epizy.com/arabic_language_tutorial_for_beginners.pdfIn PDF document text
    • http://zovuzizosagedip.epizy.com/building_information_modeling_course_in_bangalore.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/balakudovoranunejabeg.pdfIn PDF document text
    • http://gowofar.rf.gd/angle_relationships_pyramid_puzzle_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/wewesizi.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/html_tags_with_examples_and_output.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_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 5292 bytes
SHA-256: df68b3e4601c589268c91f683eb8e7bfafadd2c471c2594d7a2b59df8b4550ee
font_01_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 10680 bytes
SHA-256: 46e585d523464333dc63622f10b67f5a5bf9729c48b36bffdecaf25a6e5518ab

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