Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fde1b5679fcf9f…

MALICIOUS

PDF

66.5 KB Created: 2021-05-23 13:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f31d47e4e69403ea1bd63ad525dc1d4 SHA-1: 049559e575f7a8d8871b4aecdc406eb61dd68a38 SHA-256: 10fde1b5679fcf9fdc84a802b0143e8d658f1bf0799cca855b81b85e22650aa0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to refrigerator search terms, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=what+is+the+largest+capacity+french+door+refrigerator
    • https://cdn-cms.f-static.net/uploads/4366405/normal_6062bf595c327.pdf
    • https://cdn-cms.f-static.net/uploads/4456134/normal_601a61dc029d8.pdf
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/de1b27.pdf
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/xevamufalinok_fajinewikax_vezowagen_xewobumaz.pdf
    • https://cdn-cms.f-static.net/uploads/4366358/normal_602c2753aace9.pdf
    • https://cdn-cms.f-static.net/uploads/4376362/normal_601bac77200b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viboxikuz/tetetotodupimetovibosevon.pdf
    • https://uploads.strikinglycdn.com/files/962c8290-dda3-4140-8de9-2f4906c74a1d/ca_ed_code_leave_of_absence.pdf
    • https://s3.amazonaws.com/xupimaral/aapka_phone_ringtone.pdf
    • https://s3.amazonaws.com/ladiwuzetawedi/candidiasis_oral_tratamiento.pdf
    • https://s3.amazonaws.com/risisipajole/printable_biohazard_sign.pdf
    • https://s3.amazonaws.com/gedimuta/captive_prince_book_3_read_online.pdf
    • https://s3.amazonaws.com/pibajuwi/how_to_see_earthquakes_on_google_earth_pro.pdf
    • https://uploads.strikinglycdn.com/files/26646e03-d305-4898-99fa-d27b7a90e853/14062833081.pdf
    • https://s3.amazonaws.com/wemazun/mysql_tutorial_for_beginners_with_examples.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_off0000c638.bin
a1bdf4d065724488ba33d597be55554e2faa5035d0d162c4aaddd71b60a00c64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 5532 bytes
font_01_sfnt_off0000d91c.bin
6badb516f6b6bc1de34a0f96d17d9425217f302515d92141d4ceb36e755541c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 10460 bytes

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