Malicious PDF — malware analysis report

Static analysis result for SHA-256 5112b82599fe7051…

MALICIOUS

PDF

72.7 KB Created: 2021-05-15 02:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2122b787b0ddd82bc9079979cc403ed1 SHA-1: 2e96529460dcc9d848946d2282d2bd3a620e7b12 SHA-256: 5112b82599fe70511062b51933d71bc1a3daf5a22fc93d2f2b426a5337c65ce0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of embedded URLs and the heuristic findings of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://bologen.ru/wb?keyword=is%20the%20art%20of%20racing%20in%20the%20rain%20available%20on%20netflix
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/niresapadagadixota.pdf
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/35bc04e483.pdf
    • http://fibisazorowax.mypressonline.com/diferencia_entre_administracion_publica_y_privada.pdf
    • http://fakexexu.sportsontheweb.net/pekugame.pdf
    • http://vixinusagodax.scienceontheweb.net/kegevavixibibamobuge.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_4263bcf8edae4400b2445a7fd1949e7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12cfe2fd-9461-4d0c-88ab-76e4b596d1dd/fidadip.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_4929bc3a406845b8bc345569c5078d3a.pdf?index=true
    • http://pijosufun.myartsonline.com/telivuruxajabaxe.pdf
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_265c66e153e44e6d945e3bcdb23df2dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/160e7119-3048-440b-a748-29c01a3cf56e/mazegageguwewapubitepigu.pdf
    • https://uploads.strikinglycdn.com/files/48331c49-e726-4c61-b86e-a758710d8587/94582006040.pdf
    • https://uploads.strikinglycdn.com/files/10daf15a-867a-46ca-b1fa-7fa16b9f6fe0/70032612085.pdf
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_902bb1b68c2c463086629a1b18ea145d.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_415670555aad42bc95795c11398e93b0.pdf?index=true
    • http://nivuzujanux.myartsonline.com/16421027289.pdf
    • http://gawekavadave.epizy.com/cholesterol_diet_spanish.pdf
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_68389511e0cb43218181eafac39e9957.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_ec61052ab2df467e816a775e84183e62.pdf?index=true
    • http://nejotuwusa.rf.gd/how_to_reset_the_time_on_your_fitbit_charge_hr.pdf
    • 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_off0000dae9.bin
21ce126e40d7ff3b3aedd9dc23878192a247578ec9365a2b3630bc980429b016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5348 bytes
font_01_sfnt_off0000ed24.bin
4c60ecd5183a4115793c9a721678869d69824f7b73c6fc69a0bb7f6f2af3aad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 11156 bytes

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