Malicious PDF — malware analysis report

Static analysis result for SHA-256 61928d6312e2acc2…

MALICIOUS

PDF

69.8 KB Created: 2021-05-09 08:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba00428825cf19a26d74bcce4ea2ce90 SHA-1: 185f68d467a671e2034888de796294a37d4b1344 SHA-256: 61928d6312e2acc2dbd14976893c9529baaacaeac010d465765e8e1076238d23
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attack pattern involving redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=john+deere+7000+conservation+planter+manual+pdf
    • https://cdn.sqhk.co/zimidenex/jKLjagc/swords_and_sandals_medieval_maximus_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4425511/normal_600bd924ab7ae.pdf
    • https://cdn.sqhk.co/pimibopugugo/goHEUja/cup_stacking_challenge_worksheet.pdf
    • https://cdn-cms.f-static.net/uploads/4464083/normal_60381aea0b54c.pdf
    • https://cdn.sqhk.co/rifusofuwedi/ididigf/how_to_play_among_us_on_computer_controls.pdf
    • https://cdn.sqhk.co/gawagunikuw/jfMihih/28183662496.pdf
    • https://cdn.sqhk.co/zikegasenar/Ngghjgi/recette_sandwich_jambon_hache_buffet.pdf
    • https://static.s123-cdn-static.com/uploads/4365661/normal_5fffef2780b26.pdf
    • https://cdn.sqhk.co/gasariba/iChfb09/business_calendar_2021.pdf
    • https://static.s123-cdn-static.com/uploads/4485572/normal_5fee88e01d22d.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/ribaxisikononixo.pdf
    • https://cdn-cms.f-static.net/uploads/4476927/normal_6045facd0f2e3.pdf
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/faxit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_007a7a8c41064b198fd2f8d1a36bb1c2.pdf?index=true
    • https://fc59733d-949e-4df9-817b-fea2515c5cc7.filesusr.com/ugd/689329_4b9808fb47be45cd9978348a9c082771.pdf?index=true
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_9116bf3f3a244235ada014eea94b810b.pdf?index=true
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_925d3326141541f7ac75e35d32416b7d.pdf?index=true
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_b2321f3744e640f68c5b167308ee8b27.pdf?index=true
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_c6fbea8ddef641a1971f11e83bd689cd.pdf?index=true
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_5d6ba6edc584483d90ff224c7a45d37a.pdf?index=true
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_e1073911f9924affbc36508cb11e7829.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f4.bin
4caa16bc146f9646c728b432e19f4d42bd22ae4209d64cf4fe26cd4455168db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 5664 bytes
font_01_sfnt_off0000e61b.bin
d86efb97d5b9fb78d1d259a6f694ba1b6f98efe6d4ac26e4034fa6852301d4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 10404 bytes

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