Malicious PDF — malware analysis report

Static analysis result for SHA-256 554144bc56af537a…

MALICIOUS

PDF

101.6 KB Created: 2021-03-20 04:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d805cdcbf94c7e1a419f4cd53fa87d87 SHA-1: 701c0ca9bdabb1cadb88acf01087cdf4dbe4c876 SHA-256: 554144bc56af537a9b828ad2aa1ecb674065d7d4ffe0700eee80601d17ef4105
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for malicious purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/award?keyword=guia+maestra+para+ceneval+medicina+pdf PDF link annotation
    • http://lowabunuzoxa.getenjoyment.net/complete_list_of_ncaa_banned_substances.pdfIn PDF document text
    • http://meetsoda.pro/kajivemokolegumibokogug9wxj0.pdfIn PDF document text
    • http://ilook.market/best_topics_to_improve_englishl5zjm.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/33821043160ejo3.pdfIn PDF document text
    • http://freedate18.xyz/nouns_worksheets_for_3rd_graders6h5f5.pdfIn PDF document text
    • http://newoxoxi.mywebcommunity.org/que_es_el_realismo_juridico.pdfIn PDF document text
    • http://bratskpravojur.ru/how_to_make_a_simple_simple_homemadeiob29.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/f328234d-7fd6-4ff4-bdd8-78ebe0f93898/duracell_aa_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68de4cde-d2a9-466a-b0c0-a1054b5b73a1/91219521312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d8e9ca-748e-4f04-a9c4-d4e6a9c6c1fe/beruxofomodovukanafubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0512eaa5-37be-415e-a89a-c8f78c3072bf/novafodafosunorigija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accf3b89-d11d-40da-8628-6707c4dcc877/83138562819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fe09ec-9a0e-4ecc-a33c-b547beeed225/99_names_of_allah_in_urdu_mp3_song_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc05a44-66ad-4877-a7d0-7ad37d9a4f71/energizer_chfc3_universal_nimh_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec689dc-c5d4-43c7-914b-9bc7a34bde6a/34715097614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e6c242-01d6-40b6-be47-b3344ede2d79/93929119294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8568fb-cff6-467a-8f8a-8f953528daad/tamiya_blackfoot_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d1bb94-9630-48f8-aefa-7d12b237fd12/35229246966.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 5164 bytes
SHA-256: 233e40da5595079874422bcca10dd278b2512eb6db9e8e10581cc5c5df4031e0
font_01_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 12656 bytes
SHA-256: 254ab07094a280a27d98352875527679d4481e4fbd60eed521e1ea0d37ecd8ec
font_02_sfnt_off00016381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16381 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off000178b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c