Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1e6810ee8323cc…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 16:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a249ff343a3412fa2467fdbe6003c3fd SHA-1: a118a0797b46f47f9826ee3731fe603f15fac8c7 SHA-256: 4f1e6810ee8323cc2ef445a0def3083fd013039a3c8a3ed643c4f4aaeb2d90c4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm on disposable hosting. One prominent URL, 'https://pelibifir.ru/wix?keyword=name+generator+for+pixel+gun+3d', suggests a lure for users searching for specific terms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/wix?keyword=name+generator+for+pixel+gun+3d PDF link annotation
    • http://pixenevalir.22web.org/77572851103.pdfIn PDF document text
    • http://bopepon.22web.org/annexure_sheet_federal_circuit_court.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/SEqzgxl/warwickshire_arrow_house.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/idchdbS/unnatural_causes_in_sickness_and_in_wealth_director.pdfIn PDF document text
    • https://cdn.sqhk.co/mitapupafono/ibjjgjg/jugetesotumerojigororos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_eb5f02f738af4ea7b6e6b7918477e635.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_a5a748e4aab9400081d2b262bc90d470.pdf?index=trueIn PDF document text
    • http://vekirosa.epizy.com/le_rassemblement_dmocratique_africain.pdfIn PDF document text
    • http://fupuvafibip.rf.gd/rokudik.pdfIn PDF document text
    • http://wowinagapujepok.epizy.com/regular_expression_in_r_cheat_sheet.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_2981604ff291430bac0b18c681f6be52.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_a7a1d7e75be5432bb993ede0a52e1403.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_caf5a6e514244f38a0791c40ccff5919.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_c12d5d31ae014cf78d97725f6bab0f56.pdf?index=trueIn PDF document text
    • http://zutibebasonuf.epizy.com/50579209838.pdfIn PDF document text
    • http://tasenos.epizy.com/bonavunuke.pdfIn PDF document text
    • http://sigafuveno.epizy.com/2020_air_force_pay_chart.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_404d8accae9246889137bcbcac7e1f3b.pdf?index=trueIn PDF document text
    • http://satalinev.epizy.com/nutenalilazajifizazujak.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011ce8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CE8 6744 bytes
SHA-256: 765164e71fa576ea2c2a131fb455e2ff9946befa1b7a1f2ab0d68003334eb467
font_00_sfnt_off0000c49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49E 5264 bytes
SHA-256: ad41c2a510cb036b29293cc6cddbc80b163ef53f2d69832cb63fcfe825a1b123
font_01_sfnt_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 10280 bytes
SHA-256: 0742eaca60ed7561be75bb603905bb801707ca3ec25742b1f1f31b98a8b74e7e
font_02_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 16268 bytes
SHA-256: 4863796535311fdbc1e34008ec55b8eb50213c4c89019bf611f80efdc45dcdc7
font_03_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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