Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa22a1d0ba6fa275…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0a30f21dfa0d9979f1ea5e79b737bc55 SHA-1: 3d95133c351445d6a6b608036cfec5e2acba6584 SHA-256: fa22a1d0ba6fa275787b11ddcf61d15f65fe523df58558e7a45d27285414efed
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to external content. The document contains numerous embedded URLs, many pointing to other PDF files, suggesting an attempt to obscure the ultimate destination or to distribute a large number of potentially malicious links. The primary malicious URL identified is https://ketchas.ru/pbw?utm_term=bash+scripting+cheat+sheet+pdf, which is likely part of a phishing or content-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=bash+scripting+cheat+sheet+pdf PDF link annotation
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/2797175.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/rojudatexopa.pdfIn PDF document text
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/fosezogo_wakumovutofipig.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/7281055.pdfIn PDF document text
    • https://tisowatotaf.weebly.com/uploads/1/3/4/6/134660149/8387840.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/d47d2ef4-d1cd-4bbb-9695-083570a1379e/69686212205.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/enzymes_worksheet_igcse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb0964c-8e0a-4728-af4f-f3221d6afb26/volume_of_cuboid_questions_test.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144448020/mavugugulopoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58c66a5-85e7-4de1-9123-99da2510623e/miruboto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c275c375-382f-4241-959d-018ac25076cd/data_warehouse_definition_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86673d39-31d0-4fcb-862b-643546a548af/how_much_do_network_security_administrators_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe2c96a-ea88-49c9-ac60-5dba60a8858e/duvejifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8677717-9403-463c-a5ef-da34535c4a6d/flight_pilot_simulator_3d_free_game_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac977959-100b-450d-b34e-2834c77f1b8d/filmywap_2019_bollywood_movies_download_good_news.pdfIn PDF document text
    • http://wotesova.pbworks.com/f/74736742809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34ea8d0-8382-4ce9-a106-6130679f6ba9/jawbone_jambox_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646ceac0-d09f-4423-a8f6-3606c816d44a/37531589273.pdfIn PDF document text
    • http://zudilazo.pbworks.com/w/file/fetch/144667776/elements_of_programming_interviews_in_java_filetype.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63eb0b60-4a27-4078-b11c-d2c112acbfdd/18590292330.pdfIn PDF document text
    • http://fisojun.pbworks.com/f/ielts_gt_writing_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915651a7-ac01-4705-9495-fee942ee82dd/1462784703.pdfIn PDF document text
    • http://suwoluran.pbworks.com/f/48074610087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a95f04-fefc-4072-afb4-133b11bfe368/zilozisisuxa.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_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 5432 bytes
SHA-256: 908318ce6658e6feffa6bd675d359a3aecb7b4df033131cbdefce4ac5e557548
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 12028 bytes
SHA-256: 0aef81f2ff8b5bf2d0202dbed4bf099817404d981b71c3a8668e4a01e1343803

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