Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca7965b708d97a4…

MALICIOUS

PDF

78.3 KB Created: 2021-02-25 20:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: daf2b552ecb7c16798dcbed0d2ca758b SHA-1: 5e997dcdb88a1fcc36bf9a7cc404fdbf0ff92646 SHA-256: dca7965b708d97a4edbff1da2b39f3b07fd46d8f6584bbd16d2c319666fc2c27
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using small PDFs on disposable hosting to redirect users, likely to malicious sites. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards an attempt to redirect the user to a malicious resource.

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://baarspo.ru/aws?utm_term=romeo+and+juliet+pg3d PDF link annotation
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/6b37b2a49a.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/16420231729.pdfIn PDF document text
    • https://galujamisone.weebly.com/uploads/1/3/1/8/131871568/5971557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fcea9c87af42.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/eb82efa87d8f6eb.pdfIn PDF document text
    • http://tikejasoja.22web.org/breadman_tr440c_manual.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/journal_entries_questions_for_class_11_with_solutions_in_hindi.pdfIn PDF document text
    • http://resufomuvojos.22web.org/assassins_creed_forsaken_espaol_descargar.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/how_to_draw_a_turkey_easy_step_by_step_for_beginners.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/27854948892.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/wolasalodufegenebenosa.pdfIn PDF document text
    • http://morpeoplelife.ru/car_vin_number_free_reportzveca.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/star_wars_galaxy_of_adventures_ahsoka_tano_figure.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/8756961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_6015012eb26dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_602a8a54715b3.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/fender_super_champ_x2_amp.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
    • http://gozenabuzixi.onlinewebshop.net/tataxuwadoto.pdfIn PDF document text
    • http://zadabaxeki.rf.gd/57967255441.pdfIn PDF document text
    • http://putazosaw.epizy.com/82004157347.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5132 bytes
SHA-256: d322d2131d77eb27ae0b72053f841b485d085ed708e52b74106a6c10251e3efb
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 10560 bytes
SHA-256: a1b532ea100cd8ae2b93629ae12570065b4559063ae243c9aea25468fe3cd956
font_02_sfnt_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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