Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ffb486c021540c…

MALICIOUS

PDF

70.7 KB Created: 2021-05-23 20:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe241fd12a7a625e761036063d56718f SHA-1: 74ead1440fcc56a1a5be7706bd5981b8ea904191 SHA-256: c3ffb486c021540c7f649afaafaf76ac66f5fc6211b3a5ac95e96c13f88bf8a5
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to a URL that appears to be a lure for forgotten Apple ID passcodes. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or scam purposes. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=what+if+i+forgot+my+apple+id+passcode
    • https://cdn-cms.f-static.net/uploads/4377381/normal_6020c7bd7d9e9.pdf
    • https://cdn-cms.f-static.net/uploads/4415068/normal_605bbd05a96de.pdf
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/173203.pdf
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd30e9dd93f6.pdf
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fd60dd1e9270.pdf
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/rivikatiwijopewinuja.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/loluxomodaz_mavumefol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuxalirudidel/16025644750.pdf
    • https://s3.amazonaws.com/goveruduzewoxu/40049233349.pdf
    • https://s3.amazonaws.com/wemazun/kgb_archiver_free_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/2e1f1f09-b314-485d-8dc2-964dc36951a8/konirunenuliw.pdf
    • https://s3.amazonaws.com/jumedemimo/cctv_camera_course.pdf
    • https://uploads.strikinglycdn.com/files/946bd6a2-69dd-4ec4-b8e6-fed4f6cf3ac9/bowiwijanapuxovu.pdf
    • https://uploads.strikinglycdn.com/files/4e3795ea-d9a9-4d58-8f8e-41f0d717e3f8/how_much_do_swim_spas_cost.pdf
    • https://uploads.strikinglycdn.com/files/9567eda8-32d6-4e1f-b00d-a5eb21fc979e/describe_the_three_estates_into_which_french_society_was_divided_in_18th_century.pdf
    • https://s3.amazonaws.com/wetowuzuxit/cane_self_defense_techniques.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_off0000d6f5.bin
a431190506be080c546c32b1e878715b78e0c1c4e444143f1d2eb9ea0317ac00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 5684 bytes
font_01_sfnt_off0000ea3c.bin
31b2ad6b361974641a39f5e0517c7cd2995b503ffec01837ce6d9e9f31f0e9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10516 bytes

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