Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fde74ee3622742…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 00:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5bf7e7e5a06f1d454b3ad459209254d2 SHA-1: 22669c1308de7fa88a0594fdc5a942be8ca371a6 SHA-256: 90fde74ee36227424cebdc91516ea0d79b5b3ae61535bb9ba97ef3c46fb37be1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a potential link farm. One of the primary external URLs, 'https://midufefew.ru/award?keyword=neoplasma+ovarium+kistik+pdf', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution.

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 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.
  • 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://midufefew.ru/award?keyword=neoplasma+ovarium+kistik+pdf PDF link annotation
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/5264be7a22843e.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/dedijiribonexalorenawuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5fe9873ec5c6e.pdfIn PDF document text
    • http://tarekupi.scienceontheweb.net/que_es_el_holocausto_judio_resumen.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/sanumewileropuga.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/blackjack_basic_strategy_card.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/fda37.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/tanofugojomepepot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_5fd29e03c3c90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_9230158150ca4958a75766a6a5e0e142.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gateme/faringoamigdalitis_bacteriana_2017.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_bdab9ecdd59e45a996dade77da2b4faf.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_5674e6290286400d9ed67bc082fefa93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulozor/74109616987.pdfIn PDF document text
    • http://zekezixurul.onlinewebshop.net/nojuwisetedumunadomej.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/sugipitono.pdfIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_71e159f98d064c6db0405609d1ef80d6.pdf?index=trueIn PDF document text
    • http://xovolefewawex.atwebpages.com/asma_tratamento.pdfIn PDF document text
    • http://falariwupap.myartsonline.com/17848332553.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/routes_of_drug_administration_in_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/53974739952.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/abiude_album_vida.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sonoxatadusopuwag.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_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 5280 bytes
SHA-256: e2f6660b234f1f1ca9dccce2963444c5dec3d4120e1b781af21ee20ace4efbe5
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10228 bytes
SHA-256: 166663a8ce37a21c3bb5757995319abafa6b46d032346b05b52d9a697b4be86f

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