Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e251ddd824f3541…

MALICIOUS

PDF

113.8 KB Created: 2021-03-31 16:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aaead647899b9e80f3beebef1077a006 SHA-1: 56ba399ce1ece2da84c1b745830082a8be697ff0 SHA-256: 0e251ddd824f3541437a0f05270abe4cdc94bfb52ef9fe789ef5fd3ef81501ee
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings for PDF link farms point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/award?keyword=paganini+caprice+24+violin+pdf PDF link annotation
    • http://kyhni.site/tosuwifavujenilifoderogipsz2gg.pdfIn PDF document text
    • http://kernig.store/intuit_mint_remove_transactiondwj0r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_551205b86af1423e8728a6ed272c66fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f1d6d0-a084-4b37-95d4-28d9ca7891c8/29762929661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae25b92-b8f8-4a5d-99f3-10170532f7e4/93160867740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213bb688-ac88-45ee-9ffb-43a4f86d7852/niwemobozomon.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/tamil_movie_video_songs_in_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/backward_caste_list_in_karnataka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c449b484-e468-445d-9ac6-a1551fcc3364/blank_world_map_with_oceans_marked_in_blue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e98ae65-2f25-4c54-b166-eb8b6a0587e9/what_is_the_meaning_of_teeth_falling_out_in_dreams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2a2ea2-eb8a-44b3-8ee4-513309ec91b4/what_is_the_formula_for_finding_initial_velocity.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_081b3eac3a264cf9a69c8d24ecbb0119.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/bafoxiwojipujoreroxel.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_bbc12fd9c0194f829bbfe78ab7817cec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a4edd8-80cb-4041-8931-298fe38afbe0/18366796313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff06c05-068e-4ce6-9d78-6ecb6e623f36/kohler_20kw_diesel_generator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/tasibidobulukolonokori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ac8b7a-2d29-4d2d-a4d2-36e3c3047dab/plantronics_cs55_headset_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e92efb-d582-429f-b752-947958d59fcc/ramokidi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/what_is_the_wedding_tradition_of_jumping_over_a_broom.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_d614c2a04bce48d69a26adc561423efa.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_01166fe7913b477caab281fda6ec12fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43197f0-bdb7-482b-ad4b-e4a07b85536a/best_replacement_seat_for_schwinn_airdyne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b8b201-75c7-49ee-af3e-9e089f12ff4b/32772047713.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163E0 5424 bytes
SHA-256: 0bcb10d4542813e95db79d27597545b2f480c57558f7fdb09d7355be746b7fd7
font_01_sfnt_off0001767c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767C 14856 bytes
SHA-256: 15d10c2dc7a297378509f48ee9319709713b76db024491d6330c878e77f98779
font_02_sfnt_off0001a2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DF 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832