Malicious PDF — malware analysis report

Static analysis result for SHA-256 a106da81d0cd044f…

MALICIOUS

PDF

69.5 KB Created: 2020-11-17 16:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 542a6308a1bdd8e512bf4cab254a777b SHA-1: 1de4ad8e22bf08eb8338756515f35f1570a4cabd SHA-256: a106da81d0cd044feb7727824d2a0869c638e7e106795681c719fadf8a894435
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate it's part of a link farm and has been flagged by a machine learning classifier as malicious. The presence of embedded URLs suggests an attempt to lure users to external, potentially harmful, sites.

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://ggtraff.ru/strik?utm_term=reading+calendar+worksheets
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8946d21c3a3.pdf
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/netakiluli_lebosuniru_pigujudo_powonodowi.pdf
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f9a8aa1ee9a9.pdf
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fa6694c47e58.pdf
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5f9c1a67c8279.pdf
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f94abe7d0da0.pdf
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5f941911304e0.pdf
    • https://cdn-cms.f-static.net/uploads/4450140/normal_5f9e5820d44ab.pdf
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fadbd7fc7a66.pdf
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f92a2af92cc6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8485a33f-aa4b-40cc-98d2-4a895b453889/lolimoxaximusasebak.pdf
    • https://uploads.strikinglycdn.com/files/38d20938-b311-46fa-89d2-69dbda6232e0/rca_mobile_dvd_system_10_inch.pdf
    • https://uploads.strikinglycdn.com/files/dd889de9-b513-4472-8482-33387d03f25b/depokolamumulapiwikis.pdf
    • https://uploads.strikinglycdn.com/files/6795a57b-7378-4900-b9df-c1aa248b0b90/nedixutumopakorotif.pdf
    • https://uploads.strikinglycdn.com/files/6d1ae60f-ac4d-44ad-a643-255ad146ef67/tafsir_ibn_kathir_audio.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_off0000d1a8.bin
ba8c2dbf0f66d0d50f6119e6fa60e0db942ef6dd29cfd583c219d9a8ac3ab7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 5364 bytes
font_01_sfnt_off0000e3fa.bin
3886b7e8cfacb6b1d743849983f96168362cad379397ca410d71c200c1623330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 11080 bytes

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