Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f399e2118bf1e61…

MALICIOUS

PDF

122.6 KB Created: 2021-03-17 10:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06decc5bdbd1f6a8b53e46e9b6dae98b SHA-1: a856ba60285fef621c6d383ff99deb58c11e7022 SHA-256: 5f399e2118bf1e617066c8c5a784ab2114e693af9d9b1af49a93ceacd8983364
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to appear as a research document to trick users into visiting malicious links.

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://xajibur.ru/123?utm_term=importance+of+reliability+in+research+pdf PDF link annotation
    • http://stepka2016.xyz/brand_manager_cover_letteraj9r3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_6028a70f38720.pdfIn PDF document text
    • http://samoe-samaya.ru/anarkali_of_aarah_moviepkzt6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_602583cb1b0ca.pdfIn PDF document text
    • http://setovewurepenu.22web.org/xevisiwupovozesoremepog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_6029c47751e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5fe940d8f37cc.pdfIn PDF document text
    • http://spiritstudio.ru/light_brite_cube_refill_sheetsyl65e.pdfIn PDF document text
    • http://igoscandinavia.com/kivoxunmrxp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_602f5de55f6ac.pdfIn PDF document text
    • http://meetlait.pro/466842585119vkiw.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/furitivusenuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc12f081-3adb-4658-acca-d2cafb7a4821/97614365624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdee89c4-f6ee-487d-9ddc-f0eb2d99bf6b/jotoxutobeguxobaluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39958691-9fe1-4a13-ae86-9508d0b81f63/joseph_campbell_heros_journey_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28de53e2-d9ce-442c-b2df-21159115f6e3/90276409765.pdfIn PDF document text
    • http://wetovokerug.epizy.com/rockstar_full_movie_123mkv.pdfIn PDF document text
    • http://tosurok.myartsonline.com/83521387301.pdfIn PDF document text
    • http://tuxusajef.rf.gd/super_car_game_for_mobile.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/82820586821.pdfIn PDF document text
    • http://povumuvepu.epizy.com/fluval_fx6_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b8ea8c-3fd6-4e0d-b370-ba25d51d3ee0/48439666149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23965505-6dfe-49f0-ac59-c00f17bb79a5/21521871846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8a0d11-15c9-4e01-a614-397c4baa1007/70382183879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c65f4bc-fde0-42c6-8d56-1a95f6392f65/how_much_to_install_a_septic_drain_field.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_off0001a2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2C9 5576 bytes
SHA-256: a52ed19c5e82fe9ec6bf968cb27a33c733085f249edc308e511fa5f405b5b85a
font_01_sfnt_off0001b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B591 11364 bytes
SHA-256: ce335ae8fb852bfa1e6f08d4f7f22869768b0139f1bf35662673a9def3fa36b9

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