Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac048626dc9822c…

MALICIOUS

PDF

67.3 KB Created: 2021-01-25 15:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: ad56308b8072c70eb33475908981dac0 SHA-1: 42d37942c1bc09573db815b8de28fa04bce1494e SHA-256: 4ac048626dc9822c8b703e3b780fd994a38cc68ab1c87402fb5fa72e4bf7004d
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wb?keyword=prodigy%20math%20game%20student%20login PDF link annotation
    • https://cdn.sqhk.co/vogoxaginoje/fhBnIhc/bolajafovi.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/c8240ae6e6.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hsWhhNE/rise_of_kingdoms_best_civilization_for_kvk.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/8ZDhohi/vipigenoravitupa.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/gijegc3/sea_battle_2_tips_and_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/jvhjCje/90454436570.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/jusez.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/zagubip/casino_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/96996076822.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/chrono_trigger_guide_ps1.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/information_about_my_computer_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/plantar_fasciitis_ultrasound_guided.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/85610191445.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/anemia_falciforme_origem_genetica.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/riroji.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_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 5340 bytes
SHA-256: a884e35ce0648e7ac46bf4a36ba7d256c9fdd512f8ff1543b00b2dcca6e87681
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 10684 bytes
SHA-256: fbe4edbd78f6d17ef73737e23e89c15b6e9fe92c84c11dfc6772e09a12ba4874