Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea7042912ae2dd3…

MALICIOUS

PDF

84.8 KB Created: 2021-03-03 04:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2e7b2705f7fc31e631a50ae1b9d9e2bf SHA-1: 532fd205307fe3c4ed11a509906e1a62e12576c5 SHA-256: 0ea7042912ae2dd3097919059116a8e70136684a22ac273e13cb21ead73d6320
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains or cloud storage, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=write+an+essay+on+the+effect+of+covid+19+in+nigeria In PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/lulivajenurev-padupojigisak-zoguwijegiv.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/1621922.pdfIn PDF document text
    • http://laura-egorova.ru/revuvabixizof5j32w.pdfIn PDF document text
    • http://testvvd.xyz/free_afro_beats_instrumentalbqbho.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/vupenasusazuf.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/4847719.pdfIn PDF document text
    • http://ontrade.top/wow_classic_shredder_operating_manual_page_102pwfr.pdfIn PDF document text
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/bixifitulevazazi.pdfIn PDF document text
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/gapijopizin-gewav-wosumipetus.pdfIn PDF document text
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/5564520.pdfIn PDF document text
    • https://xamifixi.weebly.com/uploads/1/3/1/8/131871938/nokekakalemupu-fobex.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/9c15b4d06.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/doxodewelobexebek67qv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/secured_party_creditor_package.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/wajorujerenojozavirixe.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/49353307331.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_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 5636 bytes
SHA-256: 763f9beba75c494fa5e764861717a0d9061e950aa1fec854b21ba3f59a37d7fb
font_01_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 10448 bytes
SHA-256: 97e5824d59d4479616a691347190cd7e2dbecab3de6638781ccc0d0c0106f1ac

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