Malicious PDF — malware analysis report

Static analysis result for SHA-256 537cca3cf2281135…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 13:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0055e4911092380738d7a397515b2bc3 SHA-1: 8dce16d1861a84253e90bb0a9ed57993a9b63864 SHA-256: 537cca3cf22811358a588d6627117a4985eafd743c0f588c0f315b272f20f08b
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as an external URI pointing to a suspicious domain. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is structured as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to direct users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=apoptosis+pdf+unam PDF link annotation
    • http://omoikiri.info/what_kind_of_battery_goes_in_a_liftmaster_remotepieh6.pdfIn PDF document text
    • http://meetly.space/390499133138k0vs.pdfIn PDF document text
    • http://bigowet.xyz/12780986394txfea.pdfIn PDF document text
    • https://cdn.sqhk.co/bovefonot/bjjgj0Y/88700146446.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/bhgRggI/xisarupovanofokubosom.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/3166723811.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/jgiRdrc/lajuneleguzejumububez.pdfIn PDF document text
    • http://bomisedoxu.mywebcommunity.org/how_to_fix_landline_phone_no_dial_tone.pdfIn PDF document text
    • https://cdn.sqhk.co/monejipo/jhJ0Bkw/god_of_mercy_and_compassion_song.pdfIn PDF document text
    • http://jumpfs.space/buzzer_beater_anime_tagalog_versionaalms.pdfIn PDF document text
    • http://goldenframecollision.com/android_theme_store_apk26d4o.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/cat_in_the_hat_book_set.pdfIn PDF document text
    • http://demask.space/rubarafep6um3p.pdfIn PDF document text
    • http://j3vnci4.xyz/nissan_titan_service_engine_soon_codesgg96d.pdfIn PDF document text
    • http://all-system7.work/819321130633n186.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/Sif2gjJ/koxaduvabuwuvamaferud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_bcd4355bdfd14cd988740b221fafefba.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/heroes_of_olympus_movie_release_date.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_322816a62e9a4242a2a75442e28551a3.pdf?index=trueIn PDF document text
    • http://tamuluworab.rf.gd/jedikewezarigemafasan.pdfIn PDF document text
    • http://ziduxizesuvigu.rf.gd/lesson_plan_on_polygons_for_grade_2.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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 5048 bytes
SHA-256: 1f8592fe0d4c600a253ca437dbcb2a99ce92463aa985550c691b50de6ea95b05
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10508 bytes
SHA-256: 7b43c1fa86bcde4693cb878bcc423dc3a18d7706d58fe1cc2df447a19e468ef2

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