Malicious PDF — malware analysis report

Static analysis result for SHA-256 271bdd9d00bb9864…

MALICIOUS

PDF

87.2 KB Created: 2021-03-31 16:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0db97e7342355540243550f9fe402175 SHA-1: 2c9ffeb517f9b3e639f7804a479b9b0236a95064 SHA-256: 271bdd9d00bb9864509f469dc5c9b4c09b45057f91fceecca6634502a5a44d66
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to a link farm hosted on disposable domains, suggesting an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=what+is+matter+worksheets+for+5th+grade PDF link annotation
    • http://beautytopshop.site/identifying_determiners_worksheet_ks27enpc.pdfIn PDF document text
    • http://pogadai.xyz/derijoperorf8o5.pdfIn PDF document text
    • https://cdn.sqhk.co/viposaxa/hjhiAgi/car_color_by_number_pixel_art_cards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_5feaeefba8b5f.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/ichhQjb/pekodelezapoperazu.pdfIn PDF document text
    • http://goldstein.berlin/landforms_worksheet_for_kindergarten2n27y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423700/normal_5ff1167039536.pdfIn PDF document text
    • https://cdn.sqhk.co/nuponoviva/xOijhiv/halloweentown_cast_deaths.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_606369c232a12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifedesekelogu.epizy.com/zubawavo.pdfIn PDF document text
    • http://fukanabe.epizy.com/liftmaster_formula_1_travel_adjustment.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_3dbca7440d7b4039a74e87824908e852.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_81a5e9965aca46dba029c57c15ebc630.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a4bb7e-d021-44e9-afc5-1cb0a7d26f25/65092092457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf9bfd1-f8e6-47c1-9d6c-2efee5f63cad/how_to_use_nix_digital_photo_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ceb7a41-ecda-4161-9473-8320e641b0b4/suxubigowej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021fa58c-e8b0-4ff3-82d0-d11f97a6d386/jozabazajejugadowelexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2bfaef-ece8-410f-b35b-10b4ff5f563d/was_michael_jackson_bigger_than_elvis.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_95699cdc6d294fb799e5ed50cd67cda1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 5580 bytes
SHA-256: 0fc267cfe72a309b24dd512f374fc26f7b19472887164b39eaa8879984c10f7f
font_01_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 11076 bytes
SHA-256: eb0917837b0abe007db305804d0c04bf4111b04bf2bf7fc8b10f549facd036d8

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