Malicious PDF — malware analysis report

Static analysis result for SHA-256 e024d25420016416…

MALICIOUS

PDF

81.1 KB Created: 2021-03-05 11:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f614d77a683b37fbabc1a5c641355c1a SHA-1: 0eee464dbc7310f0b608668b75ed24edb1e6290a SHA-256: e024d254200164162dc0d1f148ad8c6eb0758930adfb5c974ab98c7e86117fc7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL observed is https://leonvi.ru/wix?keyword=confluence+change+background+color+of+table+row, which is likely part of the lure. No scripts were extracted, but the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://leonvi.ru/wix?keyword=confluence+change+background+color+of+table+row PDF link annotation
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/2144638.pdfIn PDF document text
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/zilotiguxebusiv_nufolitetujuk_welevibep_zatidu.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/1cPlge7/top_songs_of_the_70s_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ffd39da0f5a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5ff213c412c67.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/aSulbib/baby_boy_potty_toilet_training.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5ff91d50865a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_601dc5be302e3.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/31385.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/NwVgjzf/zombie_diary_2_evolution_hack_mod_apk.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/fivuxeride.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/fahLhbr/63207717298.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/1c6550e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_60063dc4d814d.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/OjjjjDD/movufijudatavikototapebur.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://uploads.strikinglycdn.com/files/02cd10ad-8f65-4712-9ac3-4784dbfa64fd/how_to_get_a_very_alert_baby_to_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8181876-21b4-4469-abb6-9329b27b52c3/dpsa_circular_11_of_2020.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_8f03a6fbfd1745128b427279153e22ed.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_7c29bd8d526f496d9fd00c2b641a0c6c.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_1766082d2b554f1fb9821aecb18cb5cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f214271-0796-4bd6-b98d-fc1092cd175d/nikon_sb_600_flash_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d5a2c6-6988-47e0-9388-f4746898bd12/sijepoposuzosije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea76648a-9fa6-44e8-95c8-aec90f26e62a/79239531714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb5772c-e442-434c-b4c9-c919fae7e94e/does_ipod_touch_4_have_bluetooth.pdfIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_98043635723b49bda331bc0799f6bdb1.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_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 5256 bytes
SHA-256: 296683b5a103d486305912622fe712987f26365d185ab4afebac9ecd520072bc
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 11468 bytes
SHA-256: aba2d5a46f998124c8e801da0c488b83feaca78bf8e0ef7453394b5dec473d15
font_02_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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