Malicious PDF — malware analysis report

Static analysis result for SHA-256 3440f88e4be01666…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 18:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 86665e0fc7146d03460bcf3fc3209c29 SHA-1: 8bf73245764676ba07b305d89b434767e295febe SHA-256: 3440f88e4be01666010fb703729808e828fa4072f5aa5f1dc1367f4e06ae41e0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://leonvi.ru/strik?utm_term=does+spectrum+have+heroes+and+icons+channel, is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://leonvi.ru/strik?utm_term=does+spectrum+have+heroes+and+icons+channel PDF link annotation
    • http://nubolutlion.xyz/jexologn4ged.pdfIn PDF document text
    • http://agent-ritual495.online/zara_home_furniture_review0h3do.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/xowasikazikorelidatavef.pdfIn PDF document text
    • http://instapriz.online/fearless_album_cover_2021ob5zt.pdfIn PDF document text
    • http://copyrighytsupport.com/938640673435qpcf.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/active_passive_voice_rules_chart_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_0b2983ff88e149bdaa75077e09432b8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/write_formal_leave_of_absence_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d51211-3210-438a-9033-ea6cc81e69ac/tuxasuwodazovege.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/what_are_the_principles_of_christian_faith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db966002-0a7f-4eea-a3e1-4779b71b458b/vovilexu.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/zuwalenutafobazetu.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/rugituvovodeponepasegiges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37505d45-5508-45c3-a1bd-ab21692d2333/realtek_audio_driver_free_download_for_windows_7_64-bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfbc95c-119d-4e36-8996-3741a98080c7/pillars_of_eternity_guidebook_volume_two.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a154bdbc-c68f-4797-8a2e-bdb56e5c3c77/how_do_i_set_the_day_on_my_timex_indiglo_watch.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_11b7ec0285d44514bf3d8f3d0079926a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/tiwosisoseni.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/92194488705.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_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 5372 bytes
SHA-256: 37439e4c0e9aaf48d76b112fc96a7b494006a9bb32f4d409e814cff5d2792b49
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 12012 bytes
SHA-256: 56fc39b8b585c06e57efb90434c069207eb39c06f983102a2ff240fbb30aa76b

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