Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3a823de263ea7c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 13:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c8e0b3155ee66a7f4cc1bdadc3707973 SHA-1: 0f5381d01aa570f2171cda727ebe4501ee241f76 SHA-256: 6b3a823de263ea7cad9aa09f265bb02c14f527df3ee63436f3f62fa69ddf33a4
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'round dining table size guide', suggesting a deceptive pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/123?utm_term=round+dining+table+size+guide In PDF document text
    • http://nekuwagibajese.getenjoyment.net/lakoxubifikibunujatimerin.pdfIn PDF document text
    • http://wigevopane.iblogger.org/minonasumazopegavojev.pdfIn PDF document text
    • https://cdn.sqhk.co/tazewupo/jbAieGh/applock_pro_mod_apk.pdfIn PDF document text
    • http://mizifasurogik.mywebcommunity.org/branden_jacobs_jenkins_everybody.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/ibBw5GM/bee_art_and_craft_activities.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/hH8noha/drop_it_wine_drops_reviews.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/austin_kleon_steal_like_an_artist_download.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/61059561230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_121d227596d44293bb84dead1dc1915a.pdf?index=trueIn PDF document text
    • http://josejutolaxof.rf.gd/harry_potter_and_the_half_blood_prince_chapter_30_summary.pdfIn PDF document text
    • http://mimubokufalow.rf.gd/66010040678.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/what_is_renaissance_in_english_literature.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_21894885e7b142f986d0f0bf654018c3.pdf?index=trueIn PDF document text
    • http://dobevux.epizy.com/adobe_acrobat_free_download_windows_10.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/saxophone_repair_shop_philippines.pdfIn PDF document text
    • http://woxedizoxe.rf.gd/building_materials_ies_master_notes.pdfIn PDF document text
    • http://deroselewem.epizy.com/bootstrap_dropdown_example.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_071ddfe7474d43f79afbe715abdd96ae.pdf?index=trueIn PDF document text
    • http://xefokezutuvij.epizy.com/63595304674.pdfIn PDF document text
    • http://mojenuj.atwebpages.com/catalogue_panasonic_2020.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_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 5092 bytes
SHA-256: f0ff4a9e8f67f6eb3243ee4f2d472ed2dba2f776c6e85fa80088b48ae1ec45ad
font_01_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 11236 bytes
SHA-256: fbe6ac4336a8ad6853ac6891f6ee86219e24f7b75bc1092986b3aae1f16bc693

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