Malicious PDF — malware analysis report

Static analysis result for SHA-256 92016b661a5c987e…

MALICIOUS

PDF

72.2 KB Created: 2021-06-13 00:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23d164c2465d1804eefaf655880a9ba8 SHA-1: f753737dc6d4b49b4a81a7a8c66f76d93f6fade0 SHA-256: 92016b661a5c987eff1193a45f8442f8b8151e8314b159feb2e26269b06655c2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam campaign. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://ketchas.ru/pbw?utm_term=a+guide+to+modern+econometrics+verbeek+pdf PDF link annotation
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/753954.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/6340565.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/makigolazugura-rotaki-ziwovomudes-kosozejegine.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/zatenazirogobafob.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/lojotezomasilowo.pdfIn PDF document text
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/ae5d2f.pdfIn PDF document text
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/gamaninokexovuzad.pdfIn PDF document text
    • https://vebaduxop.weebly.com/uploads/1/3/5/3/135327545/wujekedi.pdfIn PDF document text
    • https://jafexilodivoso.weebly.com/uploads/1/3/4/4/134499272/vegug-fegolo-ribasusoj-bipumejebili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3eedd87-60e5-43b5-bd34-ef6598823d3f/62209990214.pdfIn PDF document text
    • http://katexawa.pbworks.com/w/file/fetch/144699873/baxanuzuxopoven.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144686553/fatolepemet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c635ce-d25c-4937-b2cc-cb36d4ea6e4c/how_to_use_a_igloo_ice_maker.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/145212060/kinds_of_clauses_worksheet_answers_lesson_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66790e1d-6ba1-4318-8242-ac923e485261/installation_of_church_officers_litany.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/dozib.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144598944/om_namah_shivaya_song_mp3_free_download.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/walstad_method_soil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7ae44f-ca2f-406d-85f9-63492e13ddbc/xitazabikiz.pdfIn PDF document text
    • http://kegogaxevu.pbworks.com/w/file/fetch/145134930/lafogexezomefezive.pdfIn PDF document text
    • http://jevibufile.pbworks.com/f/xadusaxenew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1bbe4e-190b-4a44-b22f-7a59f357dc6c/vabexobovubik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833687c1-a1a8-49ee-b523-3f4c0f3e6db6/tafafetigisekomonaguje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539c7078-bef3-4b47-8502-df954a35718e/vofapivelofazudonegavuz.pdfIn PDF document text
    • http://tujedet.pbworks.com/w/file/fetch/145006389/zojetibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f466003-03f4-4c86-a2ef-e89f21a8b13d/3010243395.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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 5484 bytes
SHA-256: f0793f321f0f6635f80bf77f88682b24861fd4cd4d9d5c118b290ee5eeedf298
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 11084 bytes
SHA-256: c22829c6f64a8b028d7be48f466c88f458b6892e3b03059076ef8e94af8b192a

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