Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5516ddb604f5e07…

MALICIOUS

PDF

79.2 KB Created: 2021-02-20 05:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 40932b42c8929b236c37f19ee5919805 SHA-1: 4e0adca58b4c7214ff3630706dda2397c8f92a2a SHA-256: c5516ddb604f5e071f9e7c5d628ef2b0853a301572f0d5a9109c2449a927cd71
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to product information, likely to mask the malicious links.

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://jacksth.ru/strik?utm_term=minn+kota+terrova+112+i-pilot+link+-+72 PDF link annotation
    • http://vandify.com/952150212700gr8r.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/Wr09gcX/10240213081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5ff24ee0dccb9.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/eCOEWYo/tengai_makyou_zero_sd2snes.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/aiflhjV/fumanunominabopimejo.pdfIn PDF document text
    • http://postel-na-zakaz.ru/155712108075l7my.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/nadenapu.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/find_slope_and_y_intercept_from_two_points_worksheetiuggh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_600a541eb7406.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/eVek9K0/photo_editor_app_for_pc_windows_7_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5fca2a6de91fc.pdfIn PDF document text
    • http://tranquils.space/kenmore_dishwasher_ultra_wash_quiet_guard_4_resetewmkq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_6014a3035343d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_5fdd5b5950f3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/nefuba.pdfIn PDF document text
    • http://bunebuka.rf.gd/enuresis_treatment_guidelines.pdfIn PDF document text
    • http://jukatuvofijeriw.rf.gd/chubby_cheeks_nursery_rhyme_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/relion_prime_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/sharp_weather_station_spc502_instructions.pdfIn PDF document text
    • http://lesewewavofum.epizy.com/lol_fizz_guide_german.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_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 5060 bytes
SHA-256: 9e74872ab2ef545aed90b6c1c2e9527f1d30f1c9fd82fb94092164a429323d23
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 11168 bytes
SHA-256: 85ce8a212155edc6e382b01338cf61f7a7c138e66449502f5b14db779572b68d

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