Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2b246222821dc8…

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 01:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 87641bf2760e0e4e845c755a19f18f90 SHA-1: 54bf437af73266f6c78c7d862a085f3168027fa8 SHA-256: 6d2b246222821dc84bffe31263e60cc9bf0267871ed729a92d7be5d5cd753377
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=chota+bheem+photos PDF link annotation
    • http://medazuxa.mywebcommunity.org/what_has_the_least_calories_at_dunkin_donuts.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/91493714626.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/hgHUgeW/93507755029.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/cjBihgi/tigunakijutasenapij.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/94604731155.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/AijGWjj/49294183107.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/jfSBpH8/2020_best_rap_album_grammy_winner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_0cdb4f71dcc74626bd1aedb3f0004e12.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/ca_final_centre_wise_result_may_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc2b247-2467-47dc-ba42-615e18556f01/vishnu_sahasranamam_lyrics_telugu_ms_subbulakshmi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddbf62f-d915-490d-ac89-2f54dced6133/hoover_floormate_deluxe_hard_floor_cleaner_owners_manual.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_50a79fad599c493a8f577ecea183db1a.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_d61b3be5693645f1b5f5756989b1d943.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/mezonapediwopijotedivoge.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_f707800522fd44c990164e503cceddf1.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_e4d75d5d74a148149b82a71299f71e23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/245a9786-50c4-4d79-b50b-c3c9f2ca6585/how_many_volumes_of_the_walking_dead_graphic_novel_are_there.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/business_intelligence_reporting_analyst_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/wotamiwawegu.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_99e90fed39324647baf5358e7628e3ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24a3acc-9d1e-414b-a26e-ee1ce6f11cd3/what_is_circuit_design_verification.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_492616a2e5794deaaa039791218277af.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_e6317d16a977493b9119213b4f7e0359.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_41b8b6216de94d81a1081e8da85585e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/faae0e19-ef7c-4b36-b0b8-3c66e1efa701/24873285218.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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 4976 bytes
SHA-256: 8bd3e462c9395dc21ef83386aab794df886ae192b705232e69a657bf2c2b1518
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10556 bytes
SHA-256: 6a78882d6086743db92ddbb38298ce53ea64b991abec14b5d3ba24a20595a70c