Malicious PDF — malware analysis report

Static analysis result for SHA-256 47095464c08fa1ff…

MALICIOUS

PDF

79.1 KB Created: 2021-05-09 09:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0690faa7d85212e1a073b542425b775a SHA-1: 2bec17570d20308f32724d0d79dcf1d1f7000e6a SHA-256: 47095464c08fa1ffcf060b45eefae1c373d4d86db36572ddf992485d041af7f3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=consecutive+integer+word+problems+worksheet+pdf
    • http://lalat.space/jaxebiwidi2a66q.pdf
    • http://cparta.moscow/how_to_pair_with_alpine_cd_receivermvlvs.pdf
    • http://thedopemarketing.com/222565833007oswy.pdf
    • http://rawitotizoxuk.scienceontheweb.net/93787384876.pdf
    • http://euromarket.pro/war_and_peace_bbc_trailerqefxz.pdf
    • http://tazanup.mypressonline.com/motijikakegiropuwizakobi.pdf
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/lasugu_fiwux.pdf
    • http://fb-ig-violation.com/89744715764prtuw.pdf
    • http://dressnbuy.com/kenmore_ultra_wash_service_manualzcpbv.pdf
    • http://twirlini.com/53091217725biw4s.pdf
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/39c8f4ab5aa4.pdf
    • http://it50disconto.pro/how_to_pray_salatul_istikhara_in_urdukwl0k.pdf
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/b3839b.pdf
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/gogenopu-viwejadidezakok.pdf
    • http://fazurusitu.getenjoyment.net/formulaire_cerfa_13754_x_02.pdf
    • https://gutusalewizewuj.weebly.com/uploads/1/3/1/8/131871657/4393855.pdf
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/zozimofiwim.pdf
    • http://gouliwer.online/43182081896bofaf.pdf
    • http://flash-sar.online/56303316440klggc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_cbc1870d9a32492396168bbe5199ef22.pdf?index=true
    • https://c335e157-9962-4e43-983a-f5fcf491c4e2.filesusr.com/ugd/a09b09_fce370bc98b44aaeb3b00928a77148b5.pdf?index=true
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_230d027d60b749c0b2a8eca2bbb70c19.pdf?index=true
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_3ce9c90036814ab796de5772e0255a77.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_0cfb9524e0a046d78e708deda49c2b2e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b8.bin
4646b61a5f8cb6c0d656bfda1d0590740f5029623106499592451de023da288a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 5620 bytes
font_01_sfnt_off000108c1.bin
72c303cfddd76e28bc7b395563e301f7dfc681fd493895ca6b05424fbe1e84b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 10476 bytes

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