Malicious PDF — malware analysis report

Static analysis result for SHA-256 a669ae66b8e40f87…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 00:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5bfdc9e36b59cd4844c98f485d22116 SHA-1: e11d65d49f0cecb810292049defd2d5e462592f6 SHA-256: a669ae66b8e40f878736b613fbcba7260bb090ca69b6603155e2245b8e1b4b0c
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 "PDF_SEO_LINK_FARM", suggesting an attempt to direct users to malicious websites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=workouts+at+home+pdf
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5fed7cbd01577.pdf
    • https://cdn-cms.f-static.net/uploads/4481157/normal_601db43a18207.pdf
    • http://vukufitu.mywebcommunity.org/physical_and_chemical_properties_of_amines.pdf
    • https://maruvape.weebly.com/uploads/1/3/4/8/134854924/welaf-sinoperavipodi-wivanokuzulaf-voxezo.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/3741600.pdf
    • http://azules.ru/tusukawevuwusafutefoyf53c.pdf
    • http://trysucre.pro/16100226294ikkwa.pdf
    • https://static.s123-cdn-static.com/uploads/4415052/normal_5ff1c015a587f.pdf
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/8f596c68c88.pdf
    • https://tupeduwexawagov.weebly.com/uploads/1/3/1/6/131607208/e58aae077a4.pdf
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd228304e758.pdf
    • http://rfs.team/overcoming_fear_of_failure_worksheet07fnb.pdf
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/def1bca.pdf
    • https://cdn-cms.f-static.net/uploads/4408336/normal_60339ef0c8176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_b0d5f73ad5d347d09a4fbee0f1214ca0.pdf?index=true
    • https://s3.amazonaws.com/tixedujegibex/mixogidateguxuwij.pdf
    • https://s3.amazonaws.com/tomaxade/kawedikenopofutu.pdf
    • https://s3.amazonaws.com/vufupu/how_are_most_dogcatchers_paid_math_worksheet.pdf
    • https://s3.amazonaws.com/donukadizolin/hp_compaq_8000_elite_usdt_pc_bios_update.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_b93a90a6de5642a9ab8e2cf37e9042a3.pdf?index=true
    • http://polilofu.onlinewebshop.net/cinderella_solution_diet.pdf
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_7bb37aa8db6d476fbb7dcc9aa5c94d71.pdf?index=true
    • 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_off0000f87f.bin
21939413167e8e4be274fcaad949a039c30a51f34f6125e26c644d7317c4b327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 5324 bytes
font_01_sfnt_off00010a81.bin
26ea5b3380992604acab124b600e6260ba58f7e88ba3556c69c749a43a103d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10672 bytes

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