Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f673359e639e4c…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 06:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15c4e34ff0ae3da10b9eee1f55b23d35 SHA-1: 97d8fd028e6243caa08851dcbf2d1ffe2157550e SHA-256: e4f673359e639e4c53972e03c90151d0582365f02cc827e2c796152f7ecead9d
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 0.9997

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://druttle.ru/123?utm_term=asclepius+wellness+product+information PDF link annotation
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/julesikixovokadig.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/acute_cholecystitis_tokyo_guidelines.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/can_i_replace_my_optimum_modem.pdfIn PDF document text
    • https://latuxuxapeja.weebly.com/uploads/1/3/0/7/130739017/xaditifidadudab.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/lokonodedazininamaba.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/deferaladev_xixavivasasut.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/4755605.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/c7868ba971359.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/dobatizobadafitig.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/pakexosovumiruturot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevusup.atwebpages.com/bilemevuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e614a0-3df1-43ac-bbf2-3cfb8b3d2845/tatoromapuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/tifajedezumexoteb.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/kiromamiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175ad094-477b-456e-b827-97c89bd174eb/noxulewawatiziwedogak.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/jamaica_fire_brigade_job_application_form_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea32e70-3214-42fb-8b11-db3372b749d9/jixuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7559c3d4-71c6-4bd6-beba-4bf463fd80b6/what_could_cause_a_washing_machine_not_to_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a17c337-6f18-4494-9cb0-235e01311639/86071324565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d108f0f7-847c-4d38-ba04-f44b5f81fd68/questions_for_team_leader_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e11e32-7c1b-4b75-a6f9-3846a6dec21e/kung_fu_panda_3_cast_rebel_wilson.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_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 5384 bytes
SHA-256: ded1f0617f75d58c5f6c398882cb4ce0beb42d692233664d424cc59cada772d2
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 10304 bytes
SHA-256: b6e609f39970673c0ef7ef732455dbcd8e03ff9e3a2512384c51a639ace9bdbe