Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec41329e800d6db1…

MALICIOUS

PDF

91.9 KB Created: 2021-03-23 08:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1bb3e927e0780e8d3fc937949c690e1c SHA-1: 02c1f18a0da36e1577cb899a507fd5abe0828b0b SHA-256: ec41329e800d6db1f82db39adadd306f2a957596f43b522e17226f4a07a44e39
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URL 'https://jacksth.ru/123?utm_term=iycf+guidelines+2019+ppt' is a primary indicator of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/123?utm_term=iycf+guidelines+2019+ppt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fdc328e1ebc3.pdfIn PDF document text
    • http://getchambre.xyz/sinujupinaxqrj0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5fd7d013c7fb1.pdfIn PDF document text
    • http://gromstroy.com/24266026936fr1hg.pdfIn PDF document text
    • http://my-favshopd.online/git_rebase_command_explainedqiibs.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/3073047095284qbr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_6008cc90247b9.pdfIn PDF document text
    • http://remastacer.com/79934985228xhzq3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fe4a9b4525c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/UhhoghJ/fedituzas.pdfIn PDF document text
    • http://yazansoft.com/bizujede38edh.pdfIn PDF document text
    • https://cdn.sqhk.co/xodegajeriw/VWgdXiD/defender_carbon_monoxide_detector_change_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/kezinujus/ebPiiWm/82961478094.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://uploads.strikinglycdn.com/files/241c1400-d132-4668-8abf-15f3e454e99f/the_lady_with_the_dog_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2db6d97-d1ad-4ec5-bd0c-d2254a4b2d23/the_lord_of_the_rings_trilogy_-_4k_ultra_hd_includes_2d_blu-ray.pdfIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_d9a09219c45641a18f52b6cdddbc4611.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6b3d86-919a-47bd-a59e-e2ecc3cc48cf/music_an_appreciation_9th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a7ee67-2b2b-40ed-9b91-9cb965db4783/exponential_organizations_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0babdb20-bd42-47eb-9a8c-d4a44cc3b432/why_is_my_treadmill_stops_suddenly.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_f6028edc98d0457a97995de9b6d41a77.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_2dea1f53d75d443eb46e8a8d9c14d8f1.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 1872 bytes
SHA-256: cf373f8eb364677dc8d29ae0cbe658a1b8665e9067f0cd69b3a2e84d4b370a53
font_01_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 5312 bytes
SHA-256: de0a585cf97f5d53fa30a624a15718d0785043341b6d6fcddc5475c8bff90da4
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 11200 bytes
SHA-256: 6ff0e1110bd28ba934b7bb4834910745410cda4135b8a5df9a9abf927302e788
font_03_sfnt_off000153c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378