Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bceb45f8ddffc6d…

MALICIOUS

PDF

73.7 KB Created: 2021-06-05 06:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6530d3ebbbf792e2f05798950ed91e6d SHA-1: 98aa801378c59df7843d1c5f4b6fdb253f326b8a SHA-256: 1bceb45f8ddffc6d125ea5d5ade24bf87c4314aa2e6a48bd7db10e012a776743
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results. The primary URL suggests a lure related to 'Pirates of the Caribbean soundtrack piano notes' to attract unsuspecting users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=pirates+of+the+caribbean+soundtrack+piano+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455639/normal_603168ae43e4d.pdfIn PDF document text
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/gerizurotaziz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5fe3b386b5222.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/dexemunogal.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/3112782.pdfIn PDF document text
    • https://memumijakularaj.weebly.com/uploads/1/3/4/5/134507661/xexomat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453329/normal_5feb560200f04.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/werorixa-puvuzegasabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_600919229da41.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/3c07005c.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/3073309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418188/normal_5ff275ecaf30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_5fe83069a6232.pdfIn PDF document text
    • https://jofenunamupil.weebly.com/uploads/1/3/4/3/134343358/rotimawoduzito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144646782/97969160774.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/kojelugetafaw.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144451980/6.pdfIn PDF document text
    • http://kakexigodelo.pbworks.com/f/free_clarinet_sheet_music_christmas.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/tebawu.pdfIn PDF document text
    • http://jevibufile.pbworks.com/w/file/fetch/144545061/how_to_buy_pet_dank_memer.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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 5416 bytes
SHA-256: e21733ac491db34e8a0bf809df4641b718ede5c3adc02330012f89260abb7d73
font_01_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 11284 bytes
SHA-256: f60a7339885777aaee33a6d0ff55b07f20b4125ac3713b4250b9afbae70e5054