Malicious PDF — malware analysis report

Static analysis result for SHA-256 377ab889895dc6da…

MALICIOUS

PDF

76.2 KB Created: 2021-03-07 06:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 037e6846658ff95cd9aea9913bb5244b SHA-1: bb1f18835269fa97b70abf8f0c7eec48f0ba6c5a SHA-256: 377ab889895dc6dad74356caf923edbf72423c6243429c37ff237d515a8fd3b0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'golowaki.ru', suggesting it functions as a link farm to redirect users to potentially malicious sites. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://golowaki.ru/wix?keyword=dbx+pa2+manual+portugues PDF link annotation
    • http://komaxinatobofe.medianewsonline.com/liminal_thinking_review.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/is_dominos_garlic_parmesan_white_sauce_good.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/xuwaxokerotozexaxunuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_603af0c14cb00.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/wajulapebidotir-ruzumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5ffcd2ff7ec4f.pdfIn PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/molanebabexir_sosokexobe_ranolamoga_xumek.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/tevamonevisi_bilezaz.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/4073819.pdfIn PDF document text
    • https://zixulelivu.weebly.com/uploads/1/3/4/5/134507035/7479070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384633/normal_6003281c2d134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421352/normal_60005ce29cda6.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/logical_fallacies_lesson_plan_middle_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6022c1651686e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/a_series_of_unfortunate_events_film_vs_tv_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/482e4484-e81f-4fe7-9d78-64055c75b495/the_inferno_book.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/how_much_is_needed_to_start_forex_trading_in_south_africa.pdfIn PDF document text
    • http://fugulimenar.rf.gd/toxij.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/carfax_report_discount_code.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/rayagada_college_admission_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16eaf46f-8d75-4d2d-87dd-4dd483ca32ce/how_long_to_be_a_general_dentist.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/local_weather_report_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/badopabubaguneginolobupiz.pdfIn PDF document text
    • http://wuzatefiroko.epizy.com/vajukunufamirodamuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7768c0cc-2465-4dc7-af2a-370be9b0d894/skyrim_immersive_creatures_patch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669a97c5-b93d-4d5a-842a-751f970d62c0/44164051460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff4ca8c-8046-45c2-9acf-15150fb3a0b8/3857146311.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_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 5480 bytes
SHA-256: 1baed8519afe42dad040e1c7d58d28846d0fb62d9c9a1bb5381bfff126cf6d72
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 10368 bytes
SHA-256: 809c4ec59f4d1c2dfd1db082de279dabb3eae94dc90779fa97f5c35ed3a85d05