Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52ca0c8cfbc245c…

MALICIOUS

PDF

94.6 KB Created: 2021-04-30 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a633881fa42bcef19e0e5fa2122404a8 SHA-1: 68cb2e6d048f3418a8bbc058a9eade15b50b3096 SHA-256: b52ca0c8cfbc245c3531119a0aa22a574a89988ed007169b52623d147b9855ff
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, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=paid+graphic+design+internships+chicago PDF link annotation
    • http://xebubux.sportsontheweb.net/descargar_diccionario_biblico_vine.pdfIn PDF document text
    • http://shoop-fr.ru/fobubofuzijitaruvexara8f3n9.pdfIn PDF document text
    • http://insuranceautousa.com/sadness_and_sorrow_piano_midic5mj2.pdfIn PDF document text
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/vavunewoful.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/mulasixexumesigeta.pdfIn PDF document text
    • http://adanakebap.org/sinhala_wela_katha_ammage_amuthu_selhoykr.pdfIn PDF document text
    • https://mogufujekomepit.weebly.com/uploads/1/3/1/6/131607600/piwezunev.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/atlas_model_618_lathe_manual.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/vezijipefu.pdfIn PDF document text
    • http://retelikilerodad.iblogger.org/android_messages_won_t.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/jakuwojurus.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://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_80dd3e04e49040a09e6ecae95bbb4859.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_0616832c0e064b6988c5298398b1fb91.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_fa945ea0d85e449e9203b6b2fadfbaea.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_b3eac4cb145d43f688e78e91e1106cc6.pdf?index=trueIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_34b05a464f81467cb58329b802ee9e49.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_0cd5dc794b5d4fe8a24b18e38acdff3f.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_0243ba4f11084975b0e145252df65dcf.pdf?index=trueIn PDF document text
    • http://kigetivizaru.epizy.com/wesedawan.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_b099e631890d455b9803cd3779ad273a.pdf?index=trueIn PDF document text
    • http://ginarokexaf.epizy.com/xasulibe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 5092 bytes
SHA-256: af4e27b1ebc36a021fe5d9acaf01819f9fc72b25eb3b90cb95dd7f72dd1b5bbd
font_01_sfnt_off00013aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA0 10636 bytes
SHA-256: 5e1fd9807681d8ab41933de3cdacf5b479196f2d83a9dc343d8679e5219e08a1
font_02_sfnt_off00015ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3