Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d308e7553cd097…

MALICIOUS

PDF

82.4 KB Created: 2021-02-26 16:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 077c00ee3ee61edec33952654ffbfe07 SHA-1: 66e5915a17d026f9a8ce6aa74e1df43c91351e59 SHA-256: 89d308e7553cd097e57bd03cf612b517cdb546b66fbc8999e8f3b656a8e29827
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which host other PDFs, suggesting a link farm or redirection mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to access a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=jenkins+.net+core+deployment PDF link annotation
    • https://cdn.sqhk.co/polidupokasu/jchfVje/solar_system_project_work.pdfIn PDF document text
    • http://stixlife.info/diseo_asistido_por_computadora_ventajas_y_desventajasnbj2k.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/5011581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_6038ceb1a2ddb.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/gcxMKzm/mountain_bike_shops_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_6001e637a9283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_601d3259021d5.pdfIn PDF document text
    • http://badgesverified.com/writing_complete_sentences_first_grade_worksheets29fo5.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/876P8XG/notepad_compare_plugin_download_zip.pdfIn PDF document text
    • http://copyrighthelpcentral.com/hp_deskjet_3054_wireless_setup_wizard1x18p.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/jejdieG/i_wish_you_were_gay_lyrics_in_spanish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fe39011ab8a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_600de95799516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_5fd99729a3b14.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://s3.amazonaws.com/zosevid/bizagi_modeler_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/6370232811.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/9308045330.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/time_management_strategies_for_parents.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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 4984 bytes
SHA-256: 4280decf6b6a3b4943c1632493003e1af7df1da53c7a1f51d1ec52c9175fff9b
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 11160 bytes
SHA-256: 97b83625e88b4dfbc7c00df878789389b1e6281ff838b1e4fddf5474c8afd8ad
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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