Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b1282e82fda6d8…

MALICIOUS

PDF

87.5 KB Created: 2021-03-08 09:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5a9872e900599fc3c652c8eebe86c89 SHA-1: c787390bb76f33de909b2e5742391c331645c722 SHA-256: 43b1282e82fda6d86a59f3649cb09ead125ca715997c4b13c5a677988e33ce5d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to academic content, likely to trick users into clicking the malicious links. The presence of embedded URLs and the critical redirector heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=periods+3-6+ap+world+history In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_601438d557467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_600f2e198a90f.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/are_there_any_black_kpop_idols.pdfIn PDF document text
    • http://niverokime.iblogger.org/dejosazepoler.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/xifekimiwagijimukamexuz.pdfIn PDF document text
    • http://bobiruropiles.22web.org/aperture_for_mac_free_crack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fe780d1e3c4a.pdfIn PDF document text
    • http://jevetimunuz.iblogger.org/58798365078.pdfIn PDF document text
    • http://ropikapusofune.iblogger.org/latajiburatele.pdfIn PDF document text
    • http://xowivek.iblogger.org/significant_figures_multiplication_and_division_answers.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/tiniruru/bsc_nursing_form_last_date_gujarat.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/85796459254.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/banjara_new_song_video.pdfIn PDF document text
    • http://vekisofekibote.myartsonline.com/6591073171.pdfIn PDF document text
    • http://vanobibufasapes.rf.gd/fallout_4_steampunk_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/amerihealth_caritas_iowa_dispute_form.pdfIn PDF document text
    • http://dofurorumilu.epizy.com/jimupitiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135d0776-2b28-4c3e-b4fe-72ca6ae88483/what_is_the_best_compact_washer_and_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76cc84d-8a88-4348-93dc-b771165394b0/rorevijobopizukupapiwixep.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/howls_moving_castle_book_barnes_and_noble.pdfIn PDF document text
    • http://taxanateraza.rf.gd/dekotitutexojasem.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/anatomie_du_haut_appareil_urinaire.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/pejebijumetizunazemon.pdfIn PDF document text
    • http://widifusi.myartsonline.com/kisujawa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 5272 bytes
SHA-256: 675ddc2ad2c0c314f799c238d68a0cf7161eeb509282a286210535f0902d92b6
font_01_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 1716 bytes
SHA-256: 7314a8110a688275e79cb4cd5cd058a9f858becaa7f01fde0a687197ddc85302
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 12000 bytes
SHA-256: 42a5ef74244384b631f84080c0fe22c22b262b0c3988b43323c2b2b380b656c5
font_03_sfnt_off000141ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3