Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3174fe5befac1bd…

MALICIOUS

PDF

78.4 KB Created: 2021-03-22 06:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f7eecb895bf63badb087b07d3e58dc51 SHA-1: 7b9784f4ad2cc1e59334748a70136036e677ec52 SHA-256: b3174fe5befac1bd17eda69fd7175690a61451d69496b941c3197ffca7f7803b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with at least two pointing to suspicious domains that are likely part of a link farm or phishing infrastructure. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content.

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 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://kuzutuzo.ru/award?keyword=marketing+activities+pdf PDF link annotation
    • http://xavubizuj.22web.org/burnaware_free_for_mac.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/9299166d82e2af9.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/ponewarovufusutubiv.pdfIn PDF document text
    • http://xiweloju.22web.org/xepogijefalojedovinema.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/55142055765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5fcdc50658306.pdfIn PDF document text
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/8774327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fdbdc1301f93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fc7c724a4afc.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/dewalt_drill_bits_at_lowes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9fb4021e-7a49-4455-b342-c8a67e9d4369/fejulazajepupewuxedum.pdfIn PDF document text
    • http://wusudafatuzawe.epizy.com/47668650028.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/i_wish_you_more_writing_activities.pdfIn PDF document text
    • http://ziboporo.epizy.com/9962666345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7d9725-aaa4-46bd-9490-7eee64207588/medios_de_comunicacin_interna_en_una_empresa.pdfIn PDF document text
    • http://bavodokebak.rf.gd/drivers_training_written_test_study_guide.pdfIn PDF document text
    • http://vadawowugozopul.epizy.com/alangudi_pora_pulla_video_song.pdfIn PDF document text
    • http://parozetu.rf.gd/nages.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/tebonilavomudorurololed.pdfIn PDF document text
    • http://wotekobadukabuz.rf.gd/bjt_biasing_problems_and_solutions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5096 bytes
SHA-256: aedb4f396cb50c804234c77fa3f5aef34c8ea246d1b496c14a37f665c9777c0b
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10548 bytes
SHA-256: fc02378790b943f591696e20d69a399d3eb7d7b441fd3a7f93ed20ef080f9918
font_02_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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