Malicious PDF — malware analysis report

Static analysis result for SHA-256 0308734dd8bd4f4c…

MALICIOUS

PDF

73.0 KB Created: 2021-04-02 05:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 070b02ec77d329890f0cad354adb437d SHA-1: 50acbf3899a3d624f57b764f8444200da4292412 SHA-256: 0308734dd8bd4f4c2a9b2ce90d913b3c758af1a348dfe634c8239a4f214221e5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/award?keyword=my+agriculture+information+bank+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501789/normal_604ef0c99458b.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/zesexifexasuk.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/lotubulonazo.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/8b9567f7ec98.pdfIn PDF document text
    • https://pujuxuzanebov.weebly.com/uploads/1/3/5/3/135351243/tomitavuziko-kabusoropef-zegav-naxejozilifixad.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/c9b0da1d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5fdf1c262c063.pdfIn PDF document text
    • http://xelutorul.iblogger.org/letter_of_intent_sample_reddit_residency.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5ffab087870df.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/noreloxofowitomi.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/54ff5c2fa.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/kipamamuxuxalakapobizi.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/4081291.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/52941c9.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
    • http://ziwejozaz.epizy.com/jack_lalanne_power_juicer_parts.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/jeep_wrangler_jk_interior_parts_diagram.pdfIn PDF document text
    • http://fopebuzab.epizy.com/what_does_sacred_geometry_mean.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/error_handling_in_php.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_91c507f469f54624b6b961cefce3d28a.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_85f9701e8e104161a50b4f794efff10a.pdf?index=trueIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_7128d3f51ed54a449d1efe13d4f6bbb3.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_4f11249f749a48d9a29f749b2d7ce74e.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_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 5488 bytes
SHA-256: d3f377080eea41d5528ca776881874d859619b3b4501b528515471ef04f59d0f
font_01_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 10664 bytes
SHA-256: ad8ca00751a77afd5ea9386fc18b48f2a08c5927cfe6aa084948bce145b54605
font_02_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e