Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fba3e48f4ce6e86…

MALICIOUS

PDF

84.2 KB Created: 2021-03-28 08:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 76fd1d893aacf80b9f3f868a1829177a SHA-1: b3b62cd3eeaabac50c85e45ff9af50b93d2d1b93 SHA-256: 0fba3e48f4ce6e86d5bf97bba0149c930e73fce19a64426b31dfae4f83d776f0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable domains, likely to obscure malicious activity or for SEO spam. The primary purpose appears to be directing users to external, potentially harmful, content.

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://zajinet.ru/award?keyword=antigone+story+pdf PDF link annotation
    • https://pakakisokuz.weebly.com/uploads/1/3/1/3/131381756/fazane.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/vRjj4Es/which_is_better_apple_or_samsung_camera_phone.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/rifenopobiz.pdfIn PDF document text
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/1598929.pdfIn PDF document text
    • http://ergors.space/22706151415u0bei.pdfIn PDF document text
    • https://kubikimo.weebly.com/uploads/1/3/5/3/135393209/reforuwodowifupil.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/Iwpjdjg/pixel_gun_apocalypse_unblocked_66.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/10493d22ccb445.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/gvjd6Tu/aliexpress_promo_code_september_2020.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/a287d9b2bfd7.pdfIn PDF document text
    • https://tepugajir.weebly.com/uploads/1/3/0/8/130874129/6971463.pdfIn PDF document text
    • https://najijufo.weebly.com/uploads/1/3/4/7/134714833/e9e7ab9c78c.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/dibgg35/youtube_offline_video_download_apk.pdfIn PDF document text
    • http://lamenomapod.iblogger.org/25838003008.pdfIn PDF document text
    • http://ita-bio.fun/xesironomof49pei.pdfIn PDF document text
    • http://changely.club/dakafevisedeposoketz1bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogagenuju.rf.gd/48349622283.pdfIn PDF document text
    • http://vumadulel.rf.gd/64796929135.pdfIn PDF document text
    • http://towilisok.epizy.com/cat_sis_software_free.pdfIn PDF document text
    • http://gisaxuzarufol.epizy.com/vojesawewasiturutun.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_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 5056 bytes
SHA-256: 2328d43fbb478cc57c0104f4ae32c2fc4eb1037032f0c8d578307e9ce7510478
font_01_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 14416 bytes
SHA-256: 3983b9be02ed3e085fb0d5d45b135efde31b710b7485497f344a3675c06082f7

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