Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9e7664a853369f…

MALICIOUS

PDF

68.7 KB Created: 2021-03-19 19:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf119ebbffa3d2740657280a15f1a2a SHA-1: dd7011d19b1cb0cc18b2559934084c16eb342be7 SHA-256: fe9e7664a853369f88105afa5db3eb7e34ca4a89341d559b3ad41d427944ecff
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 link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards a phishing or scam campaign designed to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/aws?utm_term=breville+juicer+je98xl+uk
    • https://cdn.sqhk.co/naludibeg/TNHgeii/dipukoporuvejizesogozun.pdf
    • https://static.s123-cdn-static.com/uploads/4403680/normal_5ffe97a1623a7.pdf
    • https://cdn.sqhk.co/fujigugi/YihP9SM/28680717646.pdf
    • http://mufinofol.scienceontheweb.net/abundant_life_bible_study.pdf
    • https://cdn-cms.f-static.net/uploads/4407991/normal_6012978bc50ed.pdf
    • https://cdn.sqhk.co/nitagalut/pfgjDii/9664093229.pdf
    • https://mixizuvas.weebly.com/uploads/1/3/5/3/135383824/gutokom.pdf
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/4376047.pdf
    • http://bigijawiv.scienceontheweb.net/how_to_flush_mount_hampton_bay_ceiling_fan.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fd5f74020e8c.pdf
    • https://dogodomob.weebly.com/uploads/1/3/4/0/134017369/xubewapazamonuv.pdf
    • https://cdn-cms.f-static.net/uploads/4469631/normal_6011ec2c182bc.pdf
    • https://cdn-cms.f-static.net/uploads/4473892/normal_60511d7b6fe7e.pdf
    • https://vobokalonumenu.weebly.com/uploads/1/3/4/6/134656332/5f0f6333e1.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5fe60d2b7ba92.pdf
    • https://cdn.sqhk.co/kebubupoxiz/gfTEWic/genig.pdf
    • https://cdn.sqhk.co/jaguwubax/aheidjd/vunefalenibewedozoz.pdf
    • http://mumolazesinidix.getenjoyment.net/network_security_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4471985/normal_603fdbae3bb66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dezobod.onlinewebshop.net/destination_b1_answer_key_download.pdf
    • https://s3.amazonaws.com/zevutebulaworel/the_stranger_in_the_woods_chapter_6_summary.pdf
    • https://s3.amazonaws.com/gupojakami/jedazodowufikejigad.pdf
    • http://ketabigumowun.atwebpages.com/migomitebagabaseje.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_off0000cf82.bin
e004c3f45bdb84956222f28769861d28428e1160ee6d8f12fd7e44391be43361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 5072 bytes
font_01_sfnt_off0000e0e7.bin
8fc81747e6f2ac3810155fe9f8eaa231be6742ef985e62e1e5076c3e3b104158		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10652 bytes

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