Malicious PDF — malware analysis report

Static analysis result for SHA-256 918bde91e6f714fb…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 04:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bf2d3965379c337a569e36402b9d5e34 SHA-1: 254f2f5a1d1f193e8f4413b440827f7ff13a1e55 SHA-256: 918bde91e6f714fbea0e46223c94514ce5ea5172e25f958eaf155c8f3cb66f6d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=who+brought+bible+to+africa PDF link annotation
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/sagutuwagariku-lifanabipalupu.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/960825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_60433fcd8d74c.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/86104433131.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/74542334887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_60363212edb3c.pdfIn PDF document text
    • https://bumifinanefisan.weebly.com/uploads/1/3/2/8/132814282/fidimukupuza.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/33403425359.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/xuxorabis.pdfIn PDF document text
    • http://ropixasit.22web.org/wifadukusagilewadufixazom.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
    • http://witigunakejawi.rf.gd/mifi_6620l_reset_password.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/xovejebibo.pdfIn PDF document text
    • http://tededuliwe.rf.gd/bum_bum_bum_bole_video_song.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_16311f2d637145f58890629a04c01bf6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/bubble_bash_2_game_free.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_0a44ee9bb8ed422b815f2d817d7ab9e2.pdf?index=trueIn PDF document text
    • http://jusibutotesax.epizy.com/liquidity_risk_after_20_years.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/what_is_the_electron-domain_geometry_of_a_water_molecule.pdfIn PDF document text
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_50c18b5e061c482982b5a797e40a560f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 4896 bytes
SHA-256: 98c6e6de3378620eff2eaa0c606754a0e5ab548006583cc4bc45ca1feb4602b6
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10584 bytes
SHA-256: ad4b77984e48618f21d3122035be5f0b4941defc59e33bd6de6d86a5011dbfce
font_02_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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