Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cf4cbf3b314793…

MALICIOUS

PDF

78.2 KB Created: 2021-04-19 22:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 99c3f790450ff35b110a423454a50988 SHA-1: 06e61befdf3743e0305fba1f1dabe10b484fd492 SHA-256: b5cf4cbf3b3147933eedf39c52704066feb188e76ed53c221a27678c54b7ba1f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to a malicious site. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://pelibifir.ru/strik?utm_term=flying+trainer+wow PDF link annotation
    • https://cdn.sqhk.co/vamosopon/FIibiin/26937021131.pdfIn PDF document text
    • https://cdn.sqhk.co/lumozupa/VjhijdF/ahlta-_t_computer_based_training.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/bSNBjjP/what_happens_when_my_pandemic_unemployment_runs_out.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/jgZGwcb/25418496393.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/cXSzrCm/22891598843.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/aci_318-14_minimum_shear_reinforcement.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/boiler_types_and_classification.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/where_is_the_battery_on_a_dodge_avenger.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/cjcRVja/allegiant_flight_phoenix_to_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/Lifgcgi/tuxaruxunupo.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/72993966602.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/igaifKv/bailey_and_love_archive._org.pdfIn PDF document text
    • https://cdn.sqhk.co/mifimafonuku/NijcWie/assassin_s_creed_syndicate_evie_dress.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/fhjggjd/botakutonijexakibaponusub.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/getjbgg/84991084674.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/toguzepuze.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/hbQcjbU/sample_strategic_human_resource_management_plan.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/jozaponi/50808788005.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/winotirebuwadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/jixotidebazet.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/gubonuwanimovagakotaku.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/nijifamejazifa.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/anaganaga_oka_dheerudu_full_movie.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/lokunodux.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/17472289284.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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 4824 bytes
SHA-256: 6598198b729f01620519ff3cf97e5ef7fdad7eed461dba5711f367f9e63552f6
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 11180 bytes
SHA-256: 4aa0148a8b66d3234d5fe36ed330806d31c6e66e00729369455eb1718576d25c

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