Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4f07dc3f99fa1f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-23 18:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 47920b204d7d0d52437e2d901698845a SHA-1: aea846997a1af91f130be378319f2e457fd9ebe4 SHA-256: ae4f07dc3f99fa1f94be45bbc49d3cb8c64ae7746fc67c58cedc7c25b617783e
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to a 'Holter test report', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/123?utm_term=holter+test+report PDF link annotation
    • https://cdn.sqhk.co/sitosuduf/PNmSjjo/comment_hacker_among_us_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474205/normal_5fecb305f3ce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_6039c9f103b20.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/r9gijeG/18394278351.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/cod_ghost_cd_key_generatorau5cq.pdfIn PDF document text
    • http://bizbize-yeteriz.org/hideki_tojo_world_war_202cjs.pdfIn PDF document text
    • http://uablog.website/704579203337jlff.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/basic_excel_cheat_sheet.pdfIn PDF document text
    • http://graatorama.fun/nevutapidiruxunonrnrc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5fd721bd1dbc8.pdfIn PDF document text
    • http://teenagetutor.net/50833045402qarge.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://uploads.strikinglycdn.com/files/59ddcefe-c8bf-4fe3-a416-20f9dcd993de/baba_ramdev_yoga_book_free_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2249c512-4e5d-4d99-9b7b-97e838e6477f/kekiwidorurijaz.pdfIn PDF document text
    • http://tosabukevosubar.myartsonline.com/naniduxeranumuvekanoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc4b6c8-ec08-4752-9b92-d00838ae99ef/aeroflex_ifr_6000_test_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25677284-098a-4357-9cd4-37556288b8c5/pathfinder_wiki_adventure_paths.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1246feb-c641-4b97-bc2d-de5dbc1c61ad/linigunudikevez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4052565-4bdb-4334-a658-f3c55d2875f5/how_to_replace_a_fuse_on_a_furnace.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 4200 bytes
SHA-256: 6beacdf0054e89b4dbeda78800817a95f83522e18a40f61582ae578d912e91f7
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 10128 bytes
SHA-256: e74906395e5f69ff866a28db87c48f51034e058648cc0b9a24df9f2257333422
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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