Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee4f296a83fd15c…

MALICIOUS

PDF

73.4 KB Created: 2021-06-02 19:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a20e0a64a15de2d7b8478423cad85608 SHA-1: e916ed3a35c468aad260b3a5a37d0dc44c942147 SHA-256: dee4f296a83fd15c20fdff64808794d81abf0f0ca1d43d7d84cf49e47c6b363f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://jumiwimov.ru/123?utm_term=lion+air+crash+investigation+report PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4370278/normal_60b3064be7380.pdfIn PDF document text
    • https://darelomotusepa.weebly.com/uploads/1/3/7/4/137499239/565bc4347279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_6036b0cc61422.pdfIn PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/kawurukewiwevu.pdfIn PDF document text
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/jevimelakujelid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarogifere.pbworks.com/f/hoover_turbo_spinscrub_50_manual.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/38764416860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d91546-b217-44c0-ba82-d44a652ae411/hidden_pictures_apple.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/63272302886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3f5df6-73cc-42c0-a027-95dfbdfd2c83/fikoluvawevukex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d5d1a6-015e-413f-91be-dffa187ef3b1/28051048777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8e96d3-c082-473d-a457-40087718c9c7/maytag_2000_series_washer_error_codes_f9_e1.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/f/48028299626.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/83146544904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee50453d-21d0-4761-b6b7-8a8a88c45ba2/rivigoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ecdeeb-fa7c-4862-bcd7-b7126add87c7/whirlpool_fridge_compressor_guarantee.pdfIn PDF document text
    • http://junerew.pbworks.com/f/how_to_read_washburn_guitar_serial_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091df60c-2406-4d63-b7e3-85f33fac7a3f/kagariwijenajelasasuru.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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 5164 bytes
SHA-256: 09f91bd790b9e01ea77cc50f392fc99eb5aad605e8228213aaab5ec23297daab
font_01_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 10508 bytes
SHA-256: 66061469bcc97943690ce7007802064d3da3bc47809ea520e376fbbd2d210c0b

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