Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe795f107eae17c…

MALICIOUS

PDF

67.3 KB Created: 2021-03-11 23:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e6b30d9d900796115fcdacc5e89a2860 SHA-1: 88fbd4dee4ec3e7deaa7a546644f5e2c51ef1d9b SHA-256: dbe795f107eae17cafe1f739cca677e386ca507d6d678452f7f05d490d860f6b
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by a machine learning classifier as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Commercial loan officer interview questions and answers'. The presence of numerous external URIs, many on disposable hosting, indicates a link farm designed to redirect users to potentially malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://ponafet.ru/123?utm_term=commercial+loan+officer+interview+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/fajaleniwa/eihgfgE/office_365_admin_portal_guide.pdfIn PDF document text
    • http://fojalalut.22web.org/bput_b._pharm_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/Uhj4heH/65231552316.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/bf_video_game_wiki_2020_olympics.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/lufogopuv.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/fumuked.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/jBUVJJN/nova_launcher_prime_mod_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/jWidie1/wogubejuvuzuwufoj.pdfIn PDF document text
    • http://nanutoz.22web.org/convertidor_catalitico.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/good_handheld_steam_cleaner.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/red_cross_first_aid_kit_list.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/iev0foF/11841297848.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/jbhixnA/8798448543.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/95620842652.pdfIn PDF document text
    • http://desokore.medianewsonline.com/what_is_an_example_of_the_hidden_curriculum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibixokemur.rf.gd/wogibawoxedoriranituzo.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_b8011b8ab1f54f679b29e82f9da108eb.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_9b9830c9810e4e318e67a0bd516d9825.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_b8531231b74d4b3f8f32d3534f3e5a05.pdf?index=trueIn PDF document text
    • http://lebuloxa.epizy.com/etiologia_edema_cerebral.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_636443a9e3e6447d9ba183c17e3cde8e.pdf?index=trueIn PDF document text
    • http://jopinewo.epizy.com/aladdin_2019_ost_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 5352 bytes
SHA-256: b16d45dedfab4fc398be49f324bb6f59d086b187b605bc40079b90158abfae71
font_01_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 10016 bytes
SHA-256: 76cc06e2e94c1c684b161666601de481332a7386ce9abb8c3f77ca3e2c082bb3

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