Malicious PDF — malware analysis report

Static analysis result for SHA-256 0818b67a5eb6281c…

MALICIOUS

PDF

71.1 KB Created: 2021-02-20 23:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4ea048b8baec6bbbf58f596ede315d60 SHA-1: c963f3f28736b4c44caa8fa959181f6d54520348 SHA-256: 0818b67a5eb6281c83a8bd2e6573a533431f5f42bd40c87e20093d4791cb391f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The PDF contains a large number of external links, suggesting it functions as a link farm for SEO manipulation or to direct users to malicious sites. One of the primary URLs observed is 'https://seumenha.ru/strik?utm_term=asus+rt-n12+won%2527t+reset', which is likely the intended destination for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=asus+rt-n12+won%2527t+reset PDF link annotation
    • https://cdn.sqhk.co/mizosamox/iZPghgd/stickers_for_snapchat_to_cut_out.pdfIn PDF document text
    • https://nonizevotete.weebly.com/uploads/1/3/1/3/131384281/bovog.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/nakuwoxajetej_dekebiditobilop.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/zowinokirur_sakidoxurovunef_lufukagumeko.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/bozuto-rufuruwubid-bomovaja-zanekopo.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/fumedenododavokupir.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/tekawugevijemavunab.pdfIn PDF document text
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/mokosuleselebi-fitub-ripategiwaro-bamirofiperuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/rojopuvukit/RRKhegi/calculator_plus_free_for_pc.pdfIn PDF document text
    • http://petajofap.22web.org/jajolodar.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/jgghgdQ/96113421318.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watafewajur.rf.gd/24831140726.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/computer_network_topology.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/farmacos_anticoagulantes_clasificacion.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/28078724973.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/nomorizukezolisonalukete.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/sunshine_law_manual.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 4768 bytes
SHA-256: 798c935baa18d7324eff4a2d23238d3a3d3d535510daf5bd99ce3da63a8b164b
font_01_sfnt_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 10388 bytes
SHA-256: e75e9e87e67dcf1f73568d37b15ddf7e0f5ea0245809e4da7f09db5f4370fb93

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