Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7535b891c365291…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 08:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d12852ae6d3f248420a8a30cfc4dfd61 SHA-1: 24bc71f5031d8acfd2fd6bf5829ccf796bf86e93 SHA-256: d7535b891c36529127b47c04e83e74fcced0fd5c1dd531c625dde787caf4bf85
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs points towards a potential distribution or redirection mechanism. No scripts were extracted, but the overall structure and heuristic firings suggest a malicious intent to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://leonvi.ru/strik?utm_term=adjectives+for+the+word+sunshine PDF link annotation
    • http://dutalamujuso.66ghz.com/your_lie_in_april_clarinet_sheet_music.pdfIn PDF document text
    • http://vipogomer.iblogger.org/repair_appliance_near_me.pdfIn PDF document text
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/neleretinuxamug-poseda-lufezit-repenidanan.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/gavixopozoweja.pdfIn PDF document text
    • https://xelinibi.weebly.com/uploads/1/3/0/7/130739371/menaladovawo-jopujopazovaf-fimipuden-pozero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudovufakigib.epizy.com/currant_creek_fly_fishing_report.pdfIn PDF document text
    • http://jojugabijogi.rf.gd/spanish_words_that_start_with_k_and_their_meaning.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_72a2abdc999548bb8e881a57b3a82595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58520c75-bc8f-4b48-a0b1-401aba26da7e/48160616183.pdfIn PDF document text
    • http://xafonabikox.rf.gd/candidiasis_esofagica.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/2310837109.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/58674221914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e46e222-76b9-42c2-818a-f10a75a92b8e/patterns_of_world_history_volume_1_4th_edition.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_3c6be18c13f34eb781100293a710ed68.pdf?index=trueIn PDF document text
    • http://nagomekivi.epizy.com/19377540930.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_27a8ba717ab5443ca6040d59ad8b7369.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_e3430d54b0f3486295a661553c986063.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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5084 bytes
SHA-256: 2cff9da5ef0a69f859778edf4ad8f20b3124ed9faa96bae751eb4be9c5a34f01
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 10496 bytes
SHA-256: 17755add2da5338d3a1ca58415ce83eb9e0074b747170bf2fe1bc2c7b3b22938

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