Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ce500acf3c4c3c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-23 14:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f9ad470ee54c3f23e366393ae79390e8 SHA-1: 3f7709fa7fee9b0240610fec80eca45976646f18 SHA-256: a4ce500acf3c4c3c0b04a9b8dc0d8ffba25821c61cc7e164ccdccd97cf2e0c8d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the presence of external URIs and a link farm structure, suggesting the document is designed to redirect users to potentially harmful websites. While no scripts were extracted, the overall structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=cours+d+anglais+bac+pdf PDF link annotation
    • http://itfamily.pro/inversor_yaskawa_j1000_manual_portugues2p4yu.pdfIn PDF document text
    • http://momentikshop.space/full_vhs_tape_the_trumpet_of_the_swane5s5r.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/dobanagevutimolaxa.pdfIn PDF document text
    • http://creditpm.com/86987161889eijnw.pdfIn PDF document text
    • http://itrom.fun/kigedoxebusimeraguwil27cw4.pdfIn PDF document text
    • http://fito4ka.xyz/zaluruzemth6yg.pdfIn PDF document text
    • https://zexejofamimow.weebly.com/uploads/1/3/1/4/131438337/ruroxexaj.pdfIn PDF document text
    • http://yandex-dostav.ru/zikasedovavigaperaxzzk2.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/bd62eff7aa0f02.pdfIn PDF document text
    • http://sukaxebodaruju.iblogger.org/how_much_does_an_average_sweet_potato_weigh.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/nutritional_information_chip_shop_curry_sauce.pdfIn PDF document text
    • http://natnat.fun/bamboo_sheets_spotlight4oh9g.pdfIn PDF document text
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/jimuvabapoxuveranuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_a8cccc572746454abaab14213533c1ea.pdf?index=trueIn PDF document text
    • http://fupisetugib.rf.gd/gujubipopipinajux.pdfIn PDF document text
    • http://nejexapef.rf.gd/net_framework_4._5_2_web_installer.pdfIn PDF document text
    • http://rutozaduv.epizy.com/cant_get_pilot_to_light_on_gas_fireplace.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_5bbfd3588ad641e5a38205e9b62657f3.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_1baf18ae45964b3ca85ce9fc1fe25153.pdf?index=trueIn PDF document text
    • http://xazawipobu.rf.gd/24306367614.pdfIn PDF document text
    • http://vipezexazagi.epizy.com/tifutonakibogofikininuf.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5368 bytes
SHA-256: 267a955d641aae3e91b1dee91ce3440440c83de6437f56a4ed36a5a7bfa4660f
font_01_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 12748 bytes
SHA-256: ecbf68cef5696042dc3f96861ec1574266167731fa5447f88b02f6657ba3a83e

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