Malicious PDF — malware analysis report

Static analysis result for SHA-256 558b80f1687b775a…

MALICIOUS

PDF

74.6 KB Created: 2021-03-19 18:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 61ab3231ee8f607ee4225fdc6c16b102 SHA-1: 2634643ce2b9f638b76cb6fa2f6799827aa90898 SHA-256: 558b80f1687b775a306ffd3e58686f23d4735dbb3a1c0e3b4bd78177e3dde7f2
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain 'baarspo.ru' and flagged as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95, and an ML classifier also flagged it as malicious. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/123?utm_term=editing+and+omission+worksheets+for+class+6 PDF link annotation
    • http://refazali.mygamesonline.org/noida_extension_master_plan_2020.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/33841244344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_600945b4907bf.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/cytochromes_p450_and_metabolism_of_xenobiotics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_603dfadf4f23a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_600704c6e3173.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/how_to_activate_chakras_in_human_body.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_6025eccf4f6b9.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/cd3f35e0-b165-4083-b880-220b60f73433/are_whirlpool_french_door_refrigerators_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f55171-74f9-4b62-bf2d-7fe5aecdee7d/gobokifudumiremurubuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2b2c50-6fec-4231-960b-9c0ce84f0405/how_to_use_nmap_for_network_discovery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34b58c7-928d-424a-a183-87bba246a4c7/burger_king_whopper_nutrition_facts_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93b525d-4db9-444f-a466-18d5683c6d27/facebook_marketplace_cars_durban.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/xurediwujuruwiwirapoxubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd0e3cb-7ac8-405c-a25c-a71e495212a9/58159979516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a238c09a-adf3-45a4-9b23-38fd15c64ed6/minn_kota_ulterra_80_us2-60_w_i-pilot.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/24895400883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842493d9-01da-4fd4-91d3-0e781e430483/samsung_q7_55_wall_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3adc9e30-869e-4e9e-8366-b79f26e6d133/waragupuju.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/kubeduxufenuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157a71f3-4b59-4ee5-9c27-8479b6d94554/soneto_clxvi_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c33b73-a7d2-49f7-87b3-c21a48ed1efc/bilosikape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cbf28d4-216c-4752-b8c8-a8ce7a22d896/el_principito_audiolibro_gratis_para_descargar.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 5700 bytes
SHA-256: 72a347ea69ad51ff1de6be47bf3be1cdefcbcac9d36ed795374557ed99902f96
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 10304 bytes
SHA-256: 930c99592f9e6fd317bdaaa70e2f9b81fe27078e4f3d65e42d63fd45c8485760