Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7721299d84c7c2…

MALICIOUS

PDF

73.8 KB Created: 2021-06-01 10:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c32c373041edba6afb0671fda3af0e SHA-1: d63a262a23cd091264063a3a8a7d14dbd4fe0022 SHA-256: 6e7721299d84c7c29a4a661484c2269a58eaa66ff9f736297fdbe2c9906c21d6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, suggesting it functions as a link farm for phishing or malware distribution. One of the embedded URLs, 'https://irlanc.ru/pbw?utm_term=colegio+william+james+vi%25C3%25B1a+del+mar', is particularly suspicious and likely leads to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=colegio+william+james+vi%25C3%25B1a+del+mar
    • https://nogoxuxefileno.weebly.com/uploads/1/3/4/5/134588613/beturogaxowitu.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_60465df90ef4f.pdf
    • https://vulotimemoje.weebly.com/uploads/1/3/4/8/134846769/fofisuzugudufufem.pdf
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/7368669.pdf
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/nojut.pdf
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/nasaratesutepizevab.pdf
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/xurukan_xinok.pdf
    • https://static.s123-cdn-static.com/uploads/4472200/normal_60087de43953a.pdf
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/5685405.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0792feac-973c-43bb-9041-6e8f2abee462/76093857778.pdf
    • https://uploads.strikinglycdn.com/files/9419fc3a-d260-4264-8771-8d40af5828cc/why_is_my_samsung_fridge_running_but_not_cooling.pdf
    • https://uploads.strikinglycdn.com/files/56e36997-4bf6-4231-bd0d-ad2d171498d7/brand_identity_pricing_packages_uk.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144427728/53814893845.pdf
    • https://uploads.strikinglycdn.com/files/5a138c28-912e-45f4-b89d-62e2c0ecd5f4/how_long_will_it_take_to_read_an_average_book.pdf
    • https://uploads.strikinglycdn.com/files/cc0720e2-8ec5-4ed1-a51e-db4e048ba298/biochemistry_textbook_lehninger.pdf
    • https://uploads.strikinglycdn.com/files/85ee38e1-dc3f-4905-9747-49dcea024d7e/volilozuzez.pdf
    • https://uploads.strikinglycdn.com/files/9cca9f49-37d9-40a6-88df-f440ee74fae0/gugimolepa.pdf
    • https://uploads.strikinglycdn.com/files/6476df8d-dcec-45d5-b2e4-3730a3a7a329/how_to_download_fortnite_on_chromebook_for_free.pdf
    • http://silasofinat.pbworks.com/f/zebra_zt230_manuale_italiano.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f7.bin
5349767be4f0eeb93496ae318bc7c06fa7be9c1c005a9909f302384a569e4a38
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 5208 bytes
font_01_sfnt_off0000e2a7.bin
f6b495c8cb4f456c15448312a77549112a763fe325fcf5201c96b6f866078fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 12316 bytes
font_02_sfnt_off00010a12.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 4324 bytes