Malicious PDF — malware analysis report

Static analysis result for SHA-256 055b2ecea013a194…

MALICIOUS

PDF

77.7 KB Created: 2021-03-25 09:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f73a9086d091ff08c8afe8d52219d27e SHA-1: 37ab738e98a51957efa70715b853d0f7f1750ae0 SHA-256: 055b2ecea013a194295826e5f397fd3005611ab5834aee31f1d8542a1f6c604a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=xenoverse+1+ultimate+finish+guide PDF link annotation
    • http://copalofa.site/rivals_esports_moba_manager_cheatstnhxr.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/graphic_card_for_laptop_gaming.pdfIn PDF document text
    • http://lemovifi.iblogger.org/nespresso_store_upper_east_side.pdfIn PDF document text
    • http://insta-sale.site/income_affidavit_format_in_malayalamf6mxt.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/talulexibiwufajizufu.pdfIn PDF document text
    • http://storedubai.shop/bandeya_hd_song_free4d5h5.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hbifFgh/ballet_classes_for_adults_beginners.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/pinixor.pdfIn PDF document text
    • http://habirovradik.ru/android_10_on_android_one_phonesmwhun.pdfIn PDF document text
    • https://lekorasosin.weebly.com/uploads/1/3/4/6/134612915/88669e896.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/4gchgIN/whisper_of_the_heart_vs_the_cat_returns.pdfIn PDF document text
    • http://presente-top.store/57423494478f997p.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/gd5Zic5/fibezodutikijinukemepuso.pdfIn PDF document text
    • http://mivamoxejepije.iblogger.org/revit_bim_execution_plan_template.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/43335b0096c155.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
    • http://jupegojut.atwebpages.com/hallelujah_chorus_file.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/new_bhakti_photo.pdfIn PDF document text
    • http://wivegetozedogal.epizy.com/what_is_elective_cesarean_section.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/acramatic_2100_programming_manual.pdfIn PDF document text
    • http://foxebunuref.epizy.com/zaveg.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/37630148675.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/ice_fishing_techniques_for_rainbow_trout.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 5292 bytes
SHA-256: 5f0f1bfae80f132d2f33baa2480a040d9f8cc2ac03531bb5f705fe0e34213b4b
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 10652 bytes
SHA-256: 603b35ce1c2ae43a27e52d46f8e9d9bd4446a0995d18a9355bb925a675445e51
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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