Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554879fdf2d264d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-11 22:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c39a3396c379277e1432671f91aa1a1e SHA-1: 10b941b10d46982fbf7380bc7bb14c04e944ce2f SHA-256: 8554879fdf2d264d802d703924b034cc87c25289cae02d627ce86d940ea24181
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 0.9998

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://soxebez.ru/award?keyword=digital+marketing+pdf+journal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fd7e298c1710.pdfIn PDF document text
    • http://rokepilunip.iblogger.org/maytag_bravos_quiet_series_300_washer_not_draining.pdfIn PDF document text
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/3558447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_60026eb30a44e.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/2266403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_6040661637e02.pdfIn PDF document text
    • http://xukugolipanizo.iblogger.org/budoronipanazobodase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_5feaeebe7b4fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosifunugiwes.epizy.com/email_format_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/fupogijifemitegi.pdfIn PDF document text
    • http://nujemapamonaj.epizy.com/present_simple_very_easy_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/8389956459.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/distance_between_two_coordinates_worksheet.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/62189692562.pdfIn PDF document text
    • http://dujazenemelix.epizy.com/whirlpool_accubake_gas_stove_manual.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/tewipusogaxiwuxopala.pdfIn PDF document text
    • http://rupokabimizoju.rf.gd/momaderobeso.pdfIn PDF document text
    • http://tuxijug.rf.gd/ben_10_up_to_speed_rexdl.pdfIn PDF document text
    • http://dosazazavepa.rf.gd/difukubitenefe.pdfIn PDF document text
    • http://bomemab.epizy.com/bipolar_dsm_5.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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 5324 bytes
SHA-256: b7e2376d21674f82c463c38efc57ab3cdaedb0e355f95ccb5d309b628516a2c8
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 10648 bytes
SHA-256: 9fef148fd85f35bcb68afdfe1a38c62bb4a224c42850b685e5e177c444a29c50