Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef13800235a2d44…

MALICIOUS

PDF

85.9 KB Created: 2021-04-03 14:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 80dd3df6ffb3e0ef5bd0406ecaa1ecb5 SHA-1: 3f8d69244259ba93fb38ca68193eb53b8d287433 SHA-256: 3ef13800235a2d44023762428bf7360cbcdb462a3a1f13b470b7ea94269d6b04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=fathers+and+sons+vw+parts PDF link annotation
    • http://sedowogefinolew.iblogger.org/adventurers_league_season_8_dm_guide.pdfIn PDF document text
    • http://nateribebomulaz.medianewsonline.com/the_norton_anthology_of_short_fiction_shorter_8th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_6055abde9b4d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ff3c470c8ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_602e090441e2a.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/segominaveki.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/birmingham_city_council_housing_benefit_application_form.pdfIn PDF document text
    • http://devigebogubiret.getenjoyment.net/national_legal_services_authority_act_1987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_6041b8e9942d0.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/93035355703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tatonokewa.epizy.com/vizuzitu.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/rules_of_play_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56142b77-1980-478c-a4b7-cdf7a80be52f/51445719107.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/sat_subject_test_score_release_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8aa687-2080-4273-84e8-7df1ff8bfb28/how_to_clean_coffee_maker_keurig.pdfIn PDF document text
    • http://sunuwib.epizy.com/bojokejinazofilakegosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae1715a-ffb9-4d6c-a241-37f7619530fa/euro_pro_x_model_385x_sewing_machine.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/kebufelakivirixifurijuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b06fd31-1404-4851-a07d-71ad31801fd7/is_gdp_equal_to_revenue.pdfIn PDF document text
    • http://paguxesij.myartsonline.com/1000_books_to_read_before_you_die_list.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_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 5124 bytes
SHA-256: f1cfa7a784576a189873b1e4d23f9ce032cb858734624ec8dec74f468ecc12ee
font_01_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 11348 bytes
SHA-256: 913990f5dbe66c7005e6759e24b5025b031db25f04a804cec0b4486edf976290

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