Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fab3e788abb49c8…

MALICIOUS

PDF

85.4 KB Created: 2020-12-25 16:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab81f89703b4369369e23c6bdd279fd1 SHA-1: 73b72bc88466869d4092914ab05b0698537122c3 SHA-256: 3fab3e788abb49c8b592148d67a8a3e896e7ed81fcfa1d84fd6ff5d360b82d02
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL leading to a domain associated with malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful websites.

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://trafffe.ru/strik?utm_term=barbie+princess+wedding+dress+up+games
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5fc301965095b.pdf
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/fotumegodamasolal.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/navivomedokonodafop.pdf
    • https://tewazopeza.weebly.com/uploads/1/3/4/6/134697603/5067528.pdf
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/poloxetosavi.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/pekakon-xenaku-malus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f5bc7aed-dce5-4615-ab80-d40e32e2b6d2/bilujugeridabuketijowipen.pdf
    • https://uploads.strikinglycdn.com/files/f921f35c-c8cc-46d7-aec0-7de4300dc6b2/lg_portable_air_conditioner_10000_btu_energy_cost.pdf
    • https://uploads.strikinglycdn.com/files/56de31ec-ea2a-4642-ba15-d2cc0f5fd736/53996521194.pdf
    • https://uploads.strikinglycdn.com/files/200856ed-5a43-465a-828c-ee124162ed75/34415194257.pdf
    • https://uploads.strikinglycdn.com/files/bc67acbe-35bf-42bb-8aeb-b2b5808cac4d/52408733467.pdf
    • https://uploads.strikinglycdn.com/files/2f2b2997-6adb-4725-a230-7887543dfa37/xawunu.pdf
    • https://uploads.strikinglycdn.com/files/b8c96725-017a-4d3f-b9d8-2c7f48945a7e/alchemist_guild_ff14.pdf
    • https://uploads.strikinglycdn.com/files/e9a84342-0955-4d76-908f-eb72c222b786/46501970042.pdf
    • https://uploads.strikinglycdn.com/files/dc674ca2-1f03-446a-b65d-b0d37662edff/67369289402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b5.bin
2b4f924c107e50f534067c39306f4a18d045c6e356b7cb4067e6b81e09c461ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 5332 bytes
font_01_sfnt_off000115c0.bin
1a2f8ad5a0386b8f8bcb9b51571567873263acbd38e6d7093fa8ba949a2f1b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 10676 bytes
font_02_sfnt_off00013a18.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 4324 bytes

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