Malicious PDF — malware analysis report

Static analysis result for SHA-256 298d8df23eff19ad…

MALICIOUS

PDF

83.7 KB Created: 2021-03-26 14:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4c8a96efb0ec969582d8652057e25ab0 SHA-1: 05f89f0b41faa31a7d5d2b7afa26a85eb630487a SHA-256: 298d8df23eff19adc370d40a98f5813ced410bca139804ad06de2bb8a089c91d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration pointing to disposable hosting and suspicious domains like zajinet.ru. Heuristics indicate it functions as a link farm, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to redirect users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/wix?keyword=las+vegas+xfl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449789/normal_60075b396c043.pdfIn PDF document text
    • http://creditscoretrack.info/vurawekapemefuxe6n8eb.pdfIn PDF document text
    • http://steblin.pro/xamewidig6f42j.pdfIn PDF document text
    • http://fb-pageunderreview.com/45793353415xy7xy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_604ed14ab4e42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5fcb3788df047.pdfIn PDF document text
    • http://skidki-day.site/987332038700jrs8.pdfIn PDF document text
    • http://crispyset.online/koxunufalufakediwibukatc4149.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/469cd94b-f491-4d39-ba81-720971b702cb/mitologia_griega_de_medusa_y_poseidon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb77284-d566-4689-8558-5d159519b21c/mebiguxomobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd16925-806e-4342-82fa-7bacf22d93a3/jisekikipawupilufekilibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239ad89f-d722-46e3-92f7-7f7252d63a9b/fcps_school_calendar_2015-16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b745ee-8445-459f-859a-2c81d13159d5/how_to_change_bulb_on_panasonic_inverter_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d10fe2-c85d-49af-8740-686f509213a7/kenworth_t700_operators_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ee602a-8de3-424b-bc6b-811d19df65d9/19735537413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6885dd-7a71-4748-b6cc-6fd2e7769eaa/how_to_cancel_a_lawyer_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9ccb5d-058b-4e6c-9946-2c9de1c29e9b/is_taco_bell_food_bad_for_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3740558-a326-4367-852e-3d9c146dceed/how_to_connect_microsoft_universal_mobile_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a63d98-9a2d-4e09-8307-f5bbd4d47767/how_do_i_control_the_volume_on_my_samsung_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44dd0fc-6ba7-4ea9-b3c9-43b97e515bea/jijodomoruxenepuluro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db53182-a21b-40c8-894a-af3c5f039329/temanawup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e31c537-9199-4125-8869-9e2300c847a4/naval_reserve_personnel_command_millington_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d1fdce-d0d8-4a6a-9d03-e76aab4ef426/funny_advice_for_expecting_mothers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4f23eb-a610-4b94-8410-826fbde0e313/basc-3_scoring_subscription.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17844a7-5b02-4adb-b5c7-54e53e0d1207/restful_web_services_json_example_java_without_maven.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 4908 bytes
SHA-256: bc327f275533127a1e10f33bcb256d2efe8dad907191c5989775e101934c9742
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 10808 bytes
SHA-256: 75a87ee09e3c3f3f79de2defe6ecdfb08113f4a0d4d45104a0362ed8a3fcab65
font_02_sfnt_off00012bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501