Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6e4f6e9e5ad87e…

MALICIOUS

PDF

72.6 KB Created: 2021-03-22 05:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 39d692d1fdd1d37868ae8488d504983a SHA-1: 67d51337a6a03d9eeec25a35aa2977dddceac980 SHA-256: 3f6e4f6e9e5ad87e98b903c9694faf1bddf54f512c4b917b32555ff38fc66460
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to game downloads, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/wix?keyword=minecraft+pe+13.0.1+apk+descargar PDF link annotation
    • http://reggis.info/standard_practice_for_bracing_masonry_walls_under_construction_2012ur4ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479439/normal_5ff76086bdf90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384655/normal_6004bfd7a8aaa.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/21105005232.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465704/normal_6006f081b8270.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/wufikir.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/bjt_transistor_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405950/normal_603dc6c0316ab.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/74979561873.pdfIn PDF document text
    • http://rubyshup.space/amplified_vintage_rolling_stones_t-_shirtlhnk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_602e600855b5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a70d70f-34b8-4f20-bc92-1aaac755a94e/57030828505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cd06bf-4d44-4678-8937-1844e341d35c/paxodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f7d02f-ccf6-493e-9ee2-b420e0982a96/what_are_the_duties_of_a_woman_in_marriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58033446-0da8-4aff-a87b-366ed366c135/56259153952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4133b507-5803-44d6-84b1-0f73c02798da/14757108066.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5748 bytes
SHA-256: ea8e30937dc27c58b34859915fece6bd0e2125975cc7467ab8b216384ed6e449
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 11240 bytes
SHA-256: c7cae39b66caa5113040b2ad1112edb72565163ba3ca97da212e505eecf28c47

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