Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6826f6219ce1005…

MALICIOUS

PDF

82.9 KB Created: 2021-03-02 22:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a8a5c4760ebaabdf955add573275b9c SHA-1: 1eb31d8bbb05b22a439e20280690a654214d4823 SHA-256: b6826f6219ce100546f7aab93d2591cc0fb7439cd46c30f87c380857456803b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/wb?keyword=how%20to%20clean%20front%20load%20washer%20detergent%20dispenser PDF link annotation
    • https://cdn.sqhk.co/fufeboxeri/EjeaBjG/4_pictures_one_word_8_letters.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/soribupidaravog.pdfIn PDF document text
    • https://pixavegabub.weebly.com/uploads/1/3/5/3/135307945/fakopa.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/q76gc1S/43670679578.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/e17ibhh/baburadenogotusuje.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/TQgdjd9/popularity_of_programming_languages_pypl_index.pdfIn PDF document text
    • http://naturfresh.fun/luroxubovokosetafubuxjhe3f.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/febf5fd803.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/VhaL0qW/paridirusaze.pdfIn PDF document text
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/romuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/jfmhahg/farmville_2_country_escape_castle_of_dreams_event.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/negonanopix/bhagavad_gita_in_tamil_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/10808828434.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/maytag_neptune_dryer_not_responding.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_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 5468 bytes
SHA-256: 7ce9db625ae49b1ca4dd0b195807834d80564563df66e246333a5ee3e0faa8d1
font_01_sfnt_off00011a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 10608 bytes
SHA-256: 462a5c2acd11f96d7c90f083d214ef7affbe6259b51e75781d0b1bc261d86fe0

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