Malicious PDF — malware analysis report

Static analysis result for SHA-256 274e96ce890ec527…

MALICIOUS

PDF

77.4 KB Created: 2021-05-24 05:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa95f1c8d664e76ae3f59c8dcb8e5d48 SHA-1: be40b86faaaa8461dc7efd13c7ae954ef80a7456 SHA-256: 274e96ce890ec527878671b9e2b58535db3611ced0cb653ef1fc234c18af530a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://jumiwimov.ru/strik'. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=records+retention+schedule+example
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/libabuseta_bipajadelo.pdf
    • https://cdn-cms.f-static.net/uploads/4498702/normal_6059438e9c96a.pdf
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/dodulabobofoxevav.pdf
    • https://cdn-cms.f-static.net/uploads/4485301/normal_5fd79c2198361.pdf
    • https://cdn-cms.f-static.net/uploads/4478387/normal_5fe79ac984a95.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/vurafezazokogug.pdf
    • https://golasirase.weebly.com/uploads/1/3/1/3/131384643/9596696.pdf
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/873c1841491ba83.pdf
    • https://wijugola.weebly.com/uploads/1/3/2/3/132303023/8685523.pdf
    • https://joxejiduzimomad.weebly.com/uploads/1/3/1/3/131383973/d540631e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c45e40d-ce9b-4284-a64a-207ec10b6f6e/mizojobet.pdf
    • https://s3.amazonaws.com/furunumaroxun/c_programming_for_arduino_download.pdf
    • https://s3.amazonaws.com/zukogi/buxujukowajutaseroloj.pdf
    • https://s3.amazonaws.com/remavuj/busch_light_nutrition_information.pdf
    • https://s3.amazonaws.com/widetunipet/chapter_4._2_atomic_structure_worksheet_answers.pdf
    • https://s3.amazonaws.com/luropi/audible_books_won_t_to_kindle_fire.pdf
    • https://s3.amazonaws.com/wixamupelinere/can_you_use_quotes_in_a_summary.pdf
    • https://uploads.strikinglycdn.com/files/ab08b7df-82ea-4c04-9109-cf0dd1c1d2f6/how_to_unlock_tx1500e_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/f9e07b89-2406-4d65-9518-a5230dd62bad/how_to_help_your_adhd_child_in_school.pdf
    • https://uploads.strikinglycdn.com/files/72c00569-6c14-478b-b463-cdcb047e055d/noduvabupipomov.pdf
    • https://s3.amazonaws.com/xirixepo/alinco_dj_500t_mars_mod.pdf
    • https://s3.amazonaws.com/risisipajole/fokigonefapuro.pdf
    • https://s3.amazonaws.com/zurovajij/rufesibinu.pdf
    • 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_off0000f1ee.bin
4b00494aca33855a2c003f4fb8a4cc9208dfb3a805ac3e8b8b07022030743370
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 5388 bytes
font_01_sfnt_off00010421.bin
1ecf41c466d244e7a94ebb92d5cc368a9639edd7f2b53de225f031b55c83c904
pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10476 bytes