Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f09ef7a05e98edd…

MALICIOUS

PDF

74.3 KB Created: 2021-03-14 21:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d70dbb0ff6624ff2639bc9d4f0c425dc SHA-1: d68466ccf8f56b800d155241ed0bdb84dd0cce70 SHA-256: 6f09ef7a05e98edd5cca3e37d4d038c56b434a9e761b3618711ce7c3ce2292d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a significant number of external links, suggesting a link farm or distribution mechanism. One of the extracted URLs, 'https://soxebez.ru/123?utm_term=charcot+deformity+left+foot+icd+10', appears to be the primary lure, while 'http://vupiwur.rf.gd/70498464304.pdf' is part of the link farm. No scripts were extracted, but the PDF structure and URL patterns are indicative of phishing or malware distribution.

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://soxebez.ru/123?utm_term=charcot+deformity+left+foot+icd+10
    • https://cdn-cms.f-static.net/uploads/4410462/normal_60279c3836098.pdf
    • https://cdn.sqhk.co/kusamika/NYgghb4/moy_6_virtual_pet_game_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5ffbc062c1995.pdf
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/vebilevem.pdf
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/37d6c0bbe.pdf
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/1403035.pdf
    • https://cdn-cms.f-static.net/uploads/4484375/normal_6039d0bac135c.pdf
    • https://cdn-cms.f-static.net/uploads/4384164/normal_601b5175bdf29.pdf
    • https://cdn.sqhk.co/voguzasijur/geidTia/lorolopotekulowel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vupiwur.rf.gd/70498464304.pdf
    • https://uploads.strikinglycdn.com/files/34e1d7f4-253b-48b7-bbc9-c60c9f7b32c9/63550554706.pdf
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_ef99fd2caf634f1a8ff452ed3e5a0598.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_38cb62f0d90240cdb1bdc0ea1b45063b.pdf?index=true
    • http://datatoxozapi.epizy.com/8630738308.pdf
    • http://lovateju.rf.gd/adding_text_to_a_document_acrobat.pdf
    • https://uploads.strikinglycdn.com/files/afad48c7-dbbf-4102-825e-66f72ca68d6a/nutribullet_costco_price_uk.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_2607922bdf4f41e08efbe5b22965bacf.pdf?index=true
    • http://tobopazaxe.epizy.com/binary_number_system_notes.pdf
    • http://jimagonekitop.epizy.com/30769721680.pdf
    • https://uploads.strikinglycdn.com/files/613be7fa-5279-4a8f-aa31-7f9552f6ce62/two_by_two_nicholas_sparks_movie_release_date.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_off0000e637.bin
2abd0c1280f97dc02b5759b6e76bcc083554d5497742be8898cfbd1f5c61b17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 5284 bytes
font_01_sfnt_off0000f80a.bin
2158be8fddab27ff991b4387593c08b7646bfc7e59b509aae6ad8b025135aab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10744 bytes

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