Malicious PDF — malware analysis report

Static analysis result for SHA-256 643229e9ac05e754…

MALICIOUS

PDF

74.7 KB Created: 2021-01-09 23:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3e9c9a30ce988cf43e9a293d34cbfaf0 SHA-1: f2322f33fcce80f9a97b82b957ae0a4a96d65570 SHA-256: 643229e9ac05e754db4ef03bcaa7e5a9c49af76e0873dc7344d77647843caf00
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. The heuristic firings indicate this is a malicious redirector and a link farm, likely intended to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

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://traffmen.ru/aws?utm_term=three+types+of+verbs+worksheet In PDF document text
    • https://sizunevasiwi.weebly.com/uploads/1/3/5/3/135310428/nudiwi.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/8165866.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/8797806.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/verevoronix_depasakodog_sapupab_nimuwapaxideka.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/xudota.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/gamit-sumit-jirex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fdbb24c20dab.pdfIn PDF document text
    • https://cdn.sqhk.co/vomifavafo/LIhchdG/19379373315.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/zozomowatewejibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f89e9cfbc917.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/6202291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f993ffd9428b.pdfIn PDF document text
    • https://site-1175580.mozfiles.com/files/1175580/komufelobasaji.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/wofaniregidane-fuwos-duvudorixo-gebabupa.pdfIn PDF document text
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/e4759b819544b2c.pdfIn PDF document text
    • https://suduvigil.weebly.com/uploads/1/3/4/6/134697429/4481660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 5156 bytes
SHA-256: b1950534de13e64f77e78432dcd67231b898e476c1d6f8e3126990202604d255
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10768 bytes
SHA-256: 9cd13e7c06ef1ef1b1c2fc8b88de86b2b0afcf1b8abe55c63c7a0497aa4b6d5c

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