Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc22f6e51c1e9325…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 14:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: afbedae9f44e0979b3336820e5d985fa SHA-1: 3ae6be45ade2b511b0d49bafff8c30eaf1632649 SHA-256: fc22f6e51c1e9325ef280114bfc893bca6526acdc130f50354eee5846eef7f4c
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://zajinet.ru/wix?keyword=act+3+macbeth+reading+and+study+guide PDF link annotation
    • http://jasazotinalol.mygamesonline.org/vununal.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/idifibx/black_beauty_cast_1980.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/hieKjaD/bipagilovelidexaxujapowet.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/44546056649.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/schaum_series_fourier_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/k8jj1L2/ping_pong_rules_net_post.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/xpgjXgf/enerpac_hand_pump_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/ggjfjjr/wwe_universe_mode_tips.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/vubugedoxuva.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/dmmgcjf/world_war_ii_military_situation_maps.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/cidco_lottery_result_kharghar_ews.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/lwxiikr/spiderman_venom_lego_video.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/bLjicjj/38575407409.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/ibgeyge/wire_thickness_calculator_dc.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/geF3imM/58681765677.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/bijhbgg/rijiwogoladeloriti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zatazewoz/amazon_kindle_for_windows_10.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_a14b39a206ff405f87bb2785009b3d3d.pdf?index=trueIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_22201959cf2e4de7a00df8ae9d29d17d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/what_do_i_mix_with_crown_royal_salted_caramel.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_b71a75c8b3b04b1f92c732336d566f53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/64389083614.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_45abef24f7f645de9938453c6a5d572e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 5488 bytes
SHA-256: 4cc1d10cb98b987e63d9a87f6e0ab144cfddd7d706867fee67391d4caabbbe03
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 10388 bytes
SHA-256: 2e2b8efa415c07618ad4a57d18aa63b9502aaa7086f3bd3a2881df2bba85cc2e
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3