Malicious PDF — malware analysis report

Static analysis result for SHA-256 644cd2d58ba8b950…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 03:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8579ac604b71f386f7400d4c0102bd9f SHA-1: 68e309ae836ae94ad3b396ef2e8d6d08003a2d77 SHA-256: 644cd2d58ba8b95049d6eeefafaf0d343d83e295ce8e8a2c329cf3e790c279df
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the primary function is to drive traffic to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=bosch+glm400cl+home+depot PDF link annotation
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/kegipuvi-peluf-jefox-japovikuvi.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/sifusekujetudemiwelolig.pdfIn PDF document text
    • https://joworuzofoluj.weebly.com/uploads/1/3/2/6/132683209/7678386.pdfIn PDF document text
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/puzenomuseg.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/dictionary_definition_construction_worker.pdfIn PDF document text
    • https://revotifolalowo.weebly.com/uploads/1/3/4/7/134716495/60a22b18e949c71.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/9910c1fb2a90bf.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/jitofewizeg.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/91942459017.pdfIn PDF document text
    • http://alisaborodaenko.design/87400403898ff71w.pdfIn PDF document text
    • http://punejew.mygamesonline.org/super_mario_land_3_wario_land_cheats_gameboy.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/zososopo.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/sixejofezajijoz_gedom_jojejovozolofur.pdfIn PDF document text
    • http://ijmalan.xyz/best_android_phones_2019_under_400eeolv.pdfIn PDF document text
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/5304279.pdfIn PDF document text
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/tulusuvuwetirejom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/33474703727.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/dsl-2750b_firmware_download_eu.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/will_crunchyroll_get_one_punch_man_season_2.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_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 5460 bytes
SHA-256: d16b9affd3ca7dd8d8f47d70de08410c9b195c3cb533589f848f5db8ce31d372
font_01_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 11156 bytes
SHA-256: bc3fee297c2435135cd964e1f0167df410b11cd1ca74242c6be5b4e4a0143188

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