Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4f3505352c192e…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 01:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 58862ca34b99fcc57b178bd671820e61 SHA-1: d8762af713a89205466545715fe5caca2e33b2c9 SHA-256: ea4f3505352c192e51d4e91b958f7fb92ee99f85594b7b72dee81837bb5dc724
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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

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
  • 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://lozipotod.ru/123?utm_term=what+discounts+can+i+get+with+ebt+card PDF link annotation
    • http://xilofomodat.iblogger.org/gevazuxelij.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/88967956669.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/5333195.pdfIn PDF document text
    • http://latuha.com/psychological_disorders_list8e3m4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366659/normal_5feb3355e1bfc.pdfIn PDF document text
    • http://aires.fun/bol4_red_planet_albumnbcub.pdfIn PDF document text
    • https://patakobenidirok.weebly.com/uploads/1/3/0/7/130775678/1800539.pdfIn PDF document text
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/4f6bb6410f4ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6035716b30f89.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/7988046c9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_6001dafdc4ffe.pdfIn PDF document text
    • http://moscow-siberian-force.online/kepifodogadoofbi6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fe1fd9550e98.pdfIn PDF document text
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/xemadosipuzixa.pdfIn PDF document text
    • http://ritixabig.iblogger.org/musica_per_bambini_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455670/normal_6008a3ef64455.pdfIn PDF document text
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/sorefu_weguwizedakob_gobegemot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimajovomume.epizy.com/how_to_play_poker_with_2_players.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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 5412 bytes
SHA-256: 1ad7c21aba0376ca1f1209028d704a4d212c50a1bc578c4dffbf63873ecd1f1c
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10412 bytes
SHA-256: 69a9fd2d674e5e6ba85cef85f278352edf2fae2896c94aefa312604c5b96d9af

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