Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf37f91e58a6d96…

MALICIOUS

PDF

77.5 KB Created: 2021-04-07 10:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 946ae971a53341ca151fa236999c8a60 SHA-1: 7528f37534452b135def3a94a34504a67b4461b1 SHA-256: 3bf37f91e58a6d96f455baf07996dea81a14a4d38556b28df4ce52a7c13061f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://xajibur.ru/wix?keyword=barska+mini+biometric+safe+manual PDF link annotation
    • http://zezasarasojid.mywebcommunity.org/8503406600.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/zagagesorovikotomara.pdfIn PDF document text
    • http://tajasilikiw.22web.org/55885288975.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hhficnq/60388975586.pdfIn PDF document text
    • http://terugate.mypressonline.com/kedofojoza.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/iejypPc/futojul.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/tavubezigobi_fedoxilixozid_juwekikoliw_labijubeguwarig.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/26763831455.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/089d2.pdfIn PDF document text
    • http://zafimapi.22web.org/tizus.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/qSgfyhj/hockeytvaan_ostra_b_2019.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/poxinolod.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/gexedufixop.pdfIn PDF document text
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/muwerivavegi-xividodijubuzu-tedanovuki.pdfIn PDF document text
    • http://subumobo.22web.org/xezopozovim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/588d55ed-5285-4ae2-9908-f9bcae1aaf30/king_kong_massage_chair_5560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bb2e55-5c64-417d-a810-a9151595ff82/how_to_control_volume_with_roku_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e421633-0e57-4d67-9802-eb6107b84865/82845092679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a343bf8-a78a-4aac-abb6-394e5ece0074/cant_connect_to_my_cloud_dashboard.pdfIn PDF document text
    • http://toralixeg.rf.gd/lilujokugozezakemenusa.pdfIn PDF document text
    • http://xemenorusameker.epizy.com/zirumozalosatufolugipukov.pdfIn PDF document text
    • http://duvugagaxanawag.rf.gd/ibps_clerk_mock_test_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf2e280-3905-4122-9891-6c24f17d02b3/3633299508.pdfIn PDF document text
    • http://zikuxivifi.epizy.com/negotiable_instruments_act_1981_ppt.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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5280 bytes
SHA-256: 71f287792e5203d5cb6898f5425896dc13c09f587ff610ab35fed2bdd198b21d
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 11452 bytes
SHA-256: 61ae8ebb49fd40a7ee6b4424977aba375c23f8a026c0882adc1416190cf22c0b