Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22818c1213a455f…

MALICIOUS

PDF

73.1 KB Created: 2021-03-30 23:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e97be524219590ee6deaa7547628eafb SHA-1: 8a13099a6f3a8421e7d49c279a2a81cae9b1ff4c SHA-256: e22818c1213a455ff3d238de90f3efb31973cbf6a0faf3dcbf61fb2824a3bbf1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=ryobi+belt+sander+manual PDF link annotation
    • https://cdn.sqhk.co/favosejo/jajjyid/charmed_kampf_der_titanen_schauspieler.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/dsjgJgi/pavozapopamopuben.pdfIn PDF document text
    • https://cdn.sqhk.co/bavisimupux/icGTIJi/balls_vs_bricks_balls_vs_blocks_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/kirorakoxu/mcLZhj7/digital_thermostat_for_baseboard_heater.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://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_68332d8594c0465597e71930b273b7d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/lelijafevanenuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b983ec37-cb13-4070-86e8-ebbd406c4a7c/how_to_charge_ups_battery_without_electricity.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/44005692019.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/wekujux.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_ec59a2e3c7be45e3984b3cfb81ab15f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff8bf9b-bd10-4b3d-9d20-032d07cb395c/que_tipos_de_sistemas_operativos_de_red_hay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283e1282-7c24-480a-92e4-bc45a7c0a49a/tisupoguvonamefawaten.pdfIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_3bc3dc65e2034e72875d4a5c8cfd1cbd.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_cd3c3b974ee745de984b65bd166eff59.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_3c4937eb0dff4517bbcc368f00f19508.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ba430d-437c-4c02-8757-5b7a51599a15/50011066772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5015f04d-75b0-4ce6-907d-78b0f176af5f/mecanica_vectorial_para_ingenieros_estatica_beer_johnston_8_edicion.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_45b77a9a76b546c89454ac8626a35749.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e666c497-6686-442c-a47f-d7a9aefdafc6/attack_on_titan_season_4_wallpaper_4k_phone.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_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 5100 bytes
SHA-256: 96ebbaa7cf1f683a8ca69bdb078a88515ff66260ee2a341d1504ce094f61ba80
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 11076 bytes
SHA-256: 28c59d6a0bce7bf01e3bbc5c7a93a0d25f403d15d4f11019ea5266d962048a9a
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34