Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe9da17f8e0308a…

MALICIOUS

PDF

90.7 KB Created: 2021-05-01 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5f40aa865f855e02a8b3fda4518f14a8 SHA-1: f7f1eaa760b4dc01b8e0d0b6306cbb379759ef8c SHA-256: 8fe9da17f8e0308a59738a06cd8ca37ae01f0078973b9b4c5a27d4c6a67057e5
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, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=what+are+the+5+yamas+and+niyamas PDF link annotation
    • https://cdn.sqhk.co/poxosafixe/jczSihc/satimasavepivovijowutoga.pdfIn PDF document text
    • http://medicinfo.online/74930135873tm514.pdfIn PDF document text
    • https://wuxijize.weebly.com/uploads/1/3/4/6/134685372/8c242.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/anemia_por_deficiencia_de_vitamina_b12_tratamiento.pdfIn PDF document text
    • http://alsamcctv.com/bose_remote_control_codes_cinematerxel1.pdfIn PDF document text
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/dodofemositutegix.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/k7iaibM/65855592044.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/sefajogaduzapumon.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/3986092251.pdfIn PDF document text
    • http://enots.space/wuzukec50op.pdfIn PDF document text
    • http://poroda.site/why_is_my_apple_keyboard_not_supported_by_my_ipad6vxp9.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/shimano_di2_external_battery_mount.pdfIn PDF document text
    • http://parkingtest.xyz/carton_box_manufacturing_process0q9ki.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/tewetorizifafo.pdfIn PDF document text
    • https://beredixe.weebly.com/uploads/1/3/4/7/134762790/45d97fd33cdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_71c86e7964804cad8d0fda5ac1e98d2b.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_a86f8abdbf3545d9b46a7b222e1c40e8.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/82532961854.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/98669777457.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_ca789445d29f4323a1c31f438baba25b.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_87d1af4efc57463884258d0cc3bff751.pdf?index=trueIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_ae29d2c898234a9396b899231229c692.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 4948 bytes
SHA-256: c51a768037ac1278ab8a10224eb3d6ad565bb3070036f9d847889fb20fd7ee2a
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 13596 bytes
SHA-256: 9252d91cc35ed0dd7f14a8032239c624a5ed0946c04ec974f56abe61c8561f6c
font_02_sfnt_off00014d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D51 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176