Malicious PDF — malware analysis report

Static analysis result for SHA-256 954807a1e8396cfb…

MALICIOUS

PDF

76.5 KB Created: 2021-03-11 06:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b8fe0e01e815b520296599cd6a82f65c SHA-1: 3fc77d72e4ed869529f6923ddb780cf89f7b0c87 SHA-256: 954807a1e8396cfba4feb95034ed6f1f63d40fb61051ae7f74f0ca0f79e61115
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and utilizing UTM parameters, indicative of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

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://ponafet.ru/strik?utm_term=what+happens+in+the+giver+chapter+4 PDF link annotation
    • http://xenogogumemikek.66ghz.com/25309062204.pdfIn PDF document text
    • https://kavikazu.weebly.com/uploads/1/3/5/3/135392310/zozatoz-vofosodab-vakuxotifis-lejinenunox.pdfIn PDF document text
    • http://fb-pageunderreview.com/64285094522ivgpf.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/vizawo.pdfIn PDF document text
    • http://ecoservice-vlad.ru/fizida2s22t.pdfIn PDF document text
    • http://shopee24.site/gelitiren_anne_baba_doan_ccelolu_oku1ayim.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/sinagejubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posojorodinu.epizy.com/38572298569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9580d4-55b5-4c84-ae5e-33bd1c39361a/ub40_can_t_help_falling_in_love_lyrics.pdfIn PDF document text
    • http://lunofalogejutu.epizy.com/45675330194.pdfIn PDF document text
    • http://rewezaxow.epizy.com/adobe_reader_portable_version.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/pathophysiology_of_angina_pectoris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c326cda-4e9a-4178-bd53-6414967e89f0/software_qa_tester_jobs_near_me.pdfIn PDF document text
    • http://teworubinogo.epizy.com/54268855765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5ee4ec-c034-4669-9be0-976295649955/glacier_bay_water_cooler_no_hot_water.pdfIn PDF document text
    • http://sitotozip.rf.gd/lake_mead_crappie_fishing_reports.pdfIn PDF document text
    • http://diresudavu.rf.gd/best_light_novels_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ecd226-8378-4d5a-828d-a4d42b5a227e/11694908963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c3ac9-d6f1-4b53-8763-f05c3b264257/mimajofirisigupojoz.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5324 bytes
SHA-256: f1b54de86da1a5268db82e67bd83197cda97709e761f2c01db98d2e1e3a1f346
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 11244 bytes
SHA-256: 3ee1e2f9f06d2255c3731fddfa84e73a76deed4a9651ddc4bcd3d0b138a9585d

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