Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d3791fbacc2dd…

MALICIOUS

PDF

77.8 KB Created: 2021-04-28 00:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3d8667dd8fd05c72ac50fcf60bcf66a SHA-1: 7ecb548ed6df2f9368f68231ab806b3f246b8e45 SHA-256: 810d3791fbacc2ddd8a470a61cfe8044f3fbf16f84222ae9f4c2c2e6778c6d6c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing trojan. The presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

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://jacksth.ru/strik?utm_term=ethiopian+grade+11+maths+book+pdf PDF link annotation
    • https://morisefomu.weebly.com/uploads/1/3/0/9/130969566/46ca7.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/nilileg.pdfIn PDF document text
    • https://xikidofivikoru.weebly.com/uploads/1/3/0/7/130776888/47f14b.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/7352714.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/dasinivudesifi.pdfIn PDF document text
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/sarojasufolara.pdfIn PDF document text
    • https://cdn.sqhk.co/wotedimozer/idhiajh/79357790660.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/jutuken_fonejutotox_vanitodevatawam_vomilenug.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/fanabowe_xaputuv.pdfIn PDF document text
    • https://cdn.sqhk.co/labokezugumu/jIiayhx/old_school_arcade_games_near_me.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/zakarobo-pofafukorivibop-mepamorig-pitasaluli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosowepexinuf.epizy.com/nilai_nilai_budaya_jawa.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_d4f8007bab6b4b269cf4dcd487d755c8.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_c9e7ed9fb53d4fdd9f6e34637d4ac8ab.pdf?index=trueIn PDF document text
    • http://bibesatu.epizy.com/ladukekirawiwidixoxug.pdfIn PDF document text
    • http://xasives.rf.gd/what_is_the_total_energy_of_motion_in_the_particles_of_a_substance_called.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_314986a4ff3f4420ac18f796bde4c97f.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_7b1d8ac272f9443cac3de77156cb5bf9.pdf?index=trueIn PDF document text
    • http://xopabaw.epizy.com/84330118513.pdfIn PDF document text
    • http://buviwama.epizy.com/change_background_color_jspdf.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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5636 bytes
SHA-256: 70d3594f4bb03364d519604303ff5c4ba057644f0a932cf290bf24d53b2ec4f6
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11380 bytes
SHA-256: 47ec55f0291db06f3b96ddbe29f27ab07f699fc845021d988316157611f7550f

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