Malicious PDF — malware analysis report

Static analysis result for SHA-256 804f162c1ad2b21c…

MALICIOUS

PDF

80.3 KB Created: 2021-06-11 00:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: af3df90e2b0b5321287340b9e7e15893 SHA-1: 500081bdd2aa6b1b8c552f8ff4b798e0ca2ad7a2 SHA-256: 804f162c1ad2b21cac571c7aa377a5092af40abd6b547057bb81e061ba196125
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, including ketchas.ru and s123-cdn-static.com, which are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=how+to+switch+internet+on+chromecast PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5fc86c1a03d11.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/1895046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5fe36c3abdd26.pdfIn PDF document text
    • https://gadujixefanupu.weebly.com/uploads/1/3/1/1/131163635/nijiposi-gowumomejawa.pdfIn PDF document text
    • https://warajepij.weebly.com/uploads/1/3/4/6/134608856/3f6f4243d864.pdfIn PDF document text
    • https://fitarobut.weebly.com/uploads/1/3/4/6/134690469/resan.pdfIn PDF document text
    • https://lesoloruvurer.weebly.com/uploads/1/3/6/0/136028926/leledilepu.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/654cdc7e-9fd6-4181-98ef-7d3a4d91cffe/papojozazun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f0e54c-b742-49bf-8a81-e43d768faa5d/2nd_monitor_detected_but_no_signal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2484544-d36c-4917-988e-b7345bd08328/how_do_you_use_the_bible_hub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98604f4-6452-43cc-a455-50645d7d27cf/how_to_reset_vizio_smartcast_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99596148-881f-4298-ac2d-875039b8bd9c/when_was_the_first_jail_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9e400f-f583-4dde-8004-bf0a4c9aefde/how_to_size_compound_turbos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097fd328-b5a6-42be-956c-b23bbf2a17da/how_much_should_i_invest_in_shares_as_a_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9752e3-1595-4b17-ae28-3afe1de1e016/walmart_black_friday_2020_ad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d5b54f-3207-4785-8b0b-e83719a1ac7c/green_smoothie_shelf_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793e107b-54c8-4cd9-80ef-715832503dee/new_moon_december_14_2020_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f07f12-3a81-44ab-a6c9-fb2419e32119/47494321063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f73a14-0292-4810-b93b-851bce2d0f2c/what_is_sacred_geometry_vinyasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef1120a-937d-4725-9a29-703924705f6a/polyethylene_glycol_3350_powder_for_oral_solution_pegmove.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5060 bytes
SHA-256: 97ab49d791d86edafe907f08d101595ee3e1fde1832081e87af2edb48a7641c3
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 12192 bytes
SHA-256: 449f72c39a6652c4f0d2a40a2b82369580b3f090d1fa9c122899dc597a754ada
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7