Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bdc38a30e042f3…

MALICIOUS

PDF

77.4 KB Created: 2021-06-02 03:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab2046398a91aaf453e0143ec9e3859b SHA-1: e96f1730305351bed4f05ba20aca690edad54427 SHA-256: 23bdc38a30e042f39cc7e7b3949f38e426d3f4d1d9afe328d9de72d84a16f11b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/pbw?utm_term=ejemplos+metodo+dialectico+hegeliano PDF link annotation
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/liwegafegunik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_5fd63ab33590c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_602f72ce301a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6033ab30cfccb.pdfIn PDF document text
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/zubugowapajopibevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_604ace030807b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477155/normal_60070f882ff19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_603741e09b138.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4377379/normal_60b321230d28f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_6052df3a1675c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5fdc8b6f91ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_605dcc483a7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_600e10c249bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422622/normal_60339a9f407bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144439737/how_to_make_the_most_money_on_house_flip_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa87ac24-23fe-4dc3-a293-31440d3c167e/43771207766.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144480234/cessna_310r_cost.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/restaurant_toilet_cleaning_schedule_template.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144483696/the_amazing_spider_man_2_apkdata_mod_unlimited_coinsoffline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5405bb6-76b3-4d07-b3ea-21e8a7af3b5b/beruniximaragiputer.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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 5424 bytes
SHA-256: 2fb6f370debc9924a8c449f620fb4f897cafb180a28ac7461f9ee8689920cca6
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11668 bytes
SHA-256: 7270ff8cf62329de855d74a9c867b24aea0945455ec46b9983e4916d24378721