Malicious PDF — malware analysis report

Static analysis result for SHA-256 259529f046414ff5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 08:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 49fe23b056222ddb5e17bc5bbfd3447b SHA-1: 423783fc0a5a8961ae8f90c0b95c558fd9ccb39d SHA-256: 259529f046414ff5804483e0c7f315babcebfba9f555720af99e5163cf6c81ee
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary URL, 'https://baarspo.ru/award?keyword=obc+caste+list+in+kerala+pdf', suggests a lure to attract users searching for specific information. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/award?keyword=obc+caste+list+in+kerala+pdf PDF link annotation
    • https://cdn.sqhk.co/sewizefaxiki/gAfNYgf/16687534446.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/lUicjiu/nerimudis.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/VjbAidE/driving_car_simulator_2020_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/04jgEge/43228684309.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/j5Hjhjh/puppy_running_fast_in_circles.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/Z6PLhie/big_head_basketball_championship.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/bhggulB/97731781792.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/ogjhfsy/age_of_history_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/hhhtvha/carphone_warehouse_samsung_galaxy_a10_case.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_6ef63b2ad0e44c20ba44950d49ffd484.pdf?index=trueIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_e5b666f82723458fbf4d2cf582fcf28f.pdf?index=trueIn PDF document text
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_bebc7dcb206843baaf3e7b88f6a2aec5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/how_to_adjust_a_huffy_bike_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/dd_3.5_highest_cr_monster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e732e16-ba0a-4bbb-b646-ef4a25dc05c1/speed_queen_tr7_dryer.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_a9d2357038e1423085f119c3cdf582bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7ba755-83c5-486f-93c4-feb7fe954e8b/kayla_itsines_bbg_workout_calendar.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_12390ab2ed1b48c395d7e64bf2c2a32f.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_5cb3a1b7ec9949ca86d98c8cb58586be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07813946-ea6e-436a-b1d9-7633172f0865/33134744545.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_fe2f136d2bf14bda9d854a0d17d6e221.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/canon_580ex_ii_speedlite_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/atmosfera_i_hydrosfera_sprawdzian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e91ff84-5d62-4c52-9457-69038753042d/99521544660.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/kakitetalani.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_b83965a7b2254657b3d1ab91341b0d95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61b2805-bf88-4fa1-b229-8f1d2309328f/37103257207.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5380 bytes
SHA-256: 0aa4e989844c8f5238eeb425d160e1edf36bdbb67175237af0c5197f0d101701
font_01_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 10424 bytes
SHA-256: d2b9b17b19dd1d3fb213b61fd66dd575b37822a67d63bf671d24840c0b8bbbb0

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