Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e69a12bd6394f4…

MALICIOUS

PDF

73.6 KB Created: 2021-06-06 12:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7b2effc2d4e4040a650d27865372b190 SHA-1: 055f135a0d0d72fec4bae0fc242f9a1e55619b42 SHA-256: 26e69a12bd6394f47609be9fd602d589600403b34d94eefcff5bcaa79342b070
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'cructi.ru', which is likely part of a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document's primary purpose is to drive traffic to potentially malicious sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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://cructi.ru/pbw?utm_term=what+is+an+example+of+an+endothermic+reaction+in+everyday+life PDF link annotation
    • https://videtibap.weebly.com/uploads/1/3/2/6/132682663/2632330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_6002412be443c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_603628867060b.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/5281357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fd61eecc98ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b27fd2-3618-4b2c-9e8e-f5b0c8ebcdce/irobot_roomba_e5_5150_robot_vacuum_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102b2596-05b4-4eac-9774-1aa71ab179d3/folukopobopojalotedulurul.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/understanding_the_linux_kernel_6th_edition.pdfIn PDF document text
    • http://gutupum.pbworks.com/f/so_kind_meaning_in_urdu.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144488238/lagadebakuxibajuzigom.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144510033/is_greenies_safe_for_dogs.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/59418370352.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413256/wuditofujusumowibajezaza.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427872/53580350425.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/2006_audi_s4_avant_wagon.pdfIn PDF document text
    • http://tovemubu.pbworks.com/w/file/fetch/144551778/81198340588.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/f/nezurokefatataxisabivoxu.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144599424/72047266234.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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 5636 bytes
SHA-256: 9e54738b25bd6534bee8f768710a3713358c1841ec51afbba33cc7fb9274c0bf
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 11532 bytes
SHA-256: f1543b296f5b5f2180240f37cd61d5d33aedd6bb4b6dbbbb9402d4bd3bcb3f7b

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