Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c0e7d0363e62b3…

MALICIOUS

PDF

70.4 KB Created: 2021-04-01 16:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 851065949ee9929413878163fd50f3f3 SHA-1: d812412d5d9078aaaa7323fb4dd7fad611281a55 SHA-256: 89c0e7d0363e62b3e9f4e7f5d5cd389c184c995e239e4593351bc7f7ff938685
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. The document body, though heavily obfuscated, contains text related to computer troubleshooting, likely serving as a lure to encourage users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=what+are+the+basic+steps+in+troubleshooting+a+computer PDF link annotation
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/4863016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5ff7cc8987077.pdfIn PDF document text
    • http://jafebidit.getenjoyment.net/lelunizinov.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/22764780405.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/the_knife_of_never_letting_go_book_2.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/members_mark_5_burner_grill_review.pdfIn PDF document text
    • http://betegozoneseje.iblogger.org/labeled_map_of_africa.pdfIn PDF document text
    • http://farotosinotom.mywebcommunity.org/the_addiction_treatment_planner_includes_dsm_5_updates_5th_edition.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/texugudimavani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_604625f918e88.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/kaxivonajimebedewapu.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/behringer_inuke_nu4-6000_amplifier.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fc81c9a7a8b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_601f7dd52b4df.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/7384458.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/supodetubokolere.pdfIn PDF document text
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/7349928.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/basic_english_for_computing_student_s_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujipezoj.epizy.com/46094666594.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/supersonic_indoor_tv_antenna.pdfIn PDF document text
    • http://felepav.epizy.com/75558257221.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/un_mundo_feliz_aldous_huxley.pdfIn PDF document text
    • http://dupowoza.epizy.com/cambiar_de_a_word_editable.pdfIn PDF document text
    • http://bupalim.atwebpages.com/non_alcoholic_fatty_liver_disease_diet.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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 5500 bytes
SHA-256: a0387a1eef1da788cbc3e3b1782a30a13c5d018b16b46e861901f2459bd2876e
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 9656 bytes
SHA-256: 165296de9d5e18d2195390ae1ea81c622571dffe1ceaf04869b477791899e7a4

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