Malicious PDF — malware analysis report

Static analysis result for SHA-256 9487b66feba5e566…

MALICIOUS

PDF

73.6 KB Created: 2021-03-28 06:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8674d618c276dc520b9119efb1a3a080 SHA-1: 8ba9a659aa29a88acb73b01cd96e8b5c3d02e933 SHA-256: 9487b66feba5e5661efa5f81fe6f2c3f758884484ab5a232bc714166d7fb72f4
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 flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily corrupted, suggests a lure related to spreadsheet templates, aligning with the observed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/123?utm_term=calendar+excel+spreadsheet+template
    • http://pshcomonhere.xyz/saxon_homeschool_math_8_7_table_of_contentsd3ysv.pdf
    • http://wasegulom.mygamesonline.org/econometric_analysis_greene_download.pdf
    • http://poopo.ru/why_has_my_samsung_freezer_stopped_workingac406.pdf
    • https://static.s123-cdn-static.com/uploads/4392457/normal_5fcf7fd8aee62.pdf
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/4f0c6598.pdf
    • http://6gusevshop.space/eitim_bir_sen_aday_retmen_kitabiqopk.pdf
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/2367eac.pdf
    • https://static.s123-cdn-static.com/uploads/4410695/normal_60054d8310290.pdf
    • http://eushopvmn.site/31416647886xa6j3.pdf
    • http://sevastopol.sale/61168540201fdnpz.pdf
    • http://gromstroy.com/dukepikororudepakajapsw2m3.pdf
    • http://securityverifiedservices.com/zalinavirikamawepibajobap7prm2.pdf
    • http://app-3null.com/91407748615o91am.pdf
    • http://ooovseanalizi.ru/2006_chevrolet_malibu_maxx_lt_gas_mileage1e3x9.pdf
    • https://static.s123-cdn-static.com/uploads/4447663/normal_5ffb919c15c44.pdf
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5ff76148b306a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_998865b2b17141ed9e1589ce6435313f.pdf?index=true
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_0f7093bda21f4d11ac25ee09ba2129e6.pdf?index=true
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_255d4d707a1243a7a7d6441594828998.pdf?index=true
    • http://gumizaxewa.atwebpages.com/analog_and_digital_circuits_for_electronic_control_system_applications.pdf
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_a1bdd466706346978c4e48aed48e3a7a.pdf?index=true
    • http://besafetusupug.atwebpages.com/44_phonics_sounds_chart.pdf
    • http://miganuvag.myartsonline.com/4084985374.pdf
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_ff05826aacfe4da1a802073c9cbb7240.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_off0000e11c.bin
9a1b13c80beb20e03b07ef3272106e79685310470ca3e66b7ada434e8be48858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 5284 bytes
font_01_sfnt_off0000f2e7.bin
9c48ed2bbd6dec511949dd18884923db1d159899308583a19389e7510d867bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 11320 bytes

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