Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0d18ad4efd2cca…

MALICIOUS

PDF

79.2 KB Created: 2021-03-22 11:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b24724df172c6d5754bbc4cd5b86f1ad SHA-1: 25649311e8bfdbe66737a596f340672424ce9561 SHA-256: 1c0d18ad4efd2cca4f40d0614d3f0b23b5f93e768cfbc84cfdcd457aa8d28780
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs, including one pointing to 'gimoguvi.ru', suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=what+is+the+30+day+eating+challenge PDF link annotation
    • http://cosmeteca.com/sivogabo6ogin.pdfIn PDF document text
    • https://gevobudijopu.weebly.com/uploads/1/3/4/8/134880408/4ade22.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/semutivipejagobafofinukuj.pdfIn PDF document text
    • http://onsideball.info/how_much_does_a_public_management_earnhco14.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/77196063273.pdfIn PDF document text
    • https://nixozetite.weebly.com/uploads/1/3/0/8/130873825/xiwowamup.pdfIn PDF document text
    • http://msertis.xyz/zedirujanegutikomjct2p.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/introduction_to_phonetics_and_phonology_book.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/mebebidonifi.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/futamo/annual_performance_appraisal_report.pdfIn PDF document text
    • http://rejizupufuxetib.rf.gd/39131039228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d305868-55d9-42d2-b3a4-7c28bf13242f/where_to_read_the_misfit_of_demon_king_academy_for_free.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/72248141265.pdfIn PDF document text
    • http://turolikuzadera.epizy.com/lexafopukevotamomigope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3459461-e59e-4877-8828-92969dffbe7c/what_does_the_term_tee_off_mean_in_a_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1b995d-c030-49e0-a90f-0249cd6ff565/what_is_imagery_in_sports_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/my_excel_sheet_won_t_scroll_down.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/administration_publique_haitienne.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/34838710953.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/which_bible_is_the_most_authentic.pdfIn PDF document text
    • http://mujotipaxoxi.epizy.com/playstation_2_emulator_for_android_phones.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_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 5528 bytes
SHA-256: 8e9863c576a1e91b6d66db4d82b5e59b9bdcbe6e6cf252feb88dd73286019ab8
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 11524 bytes
SHA-256: 10cae64a9b07895814698ed2c53b23604c2fd40504db37206a29ee891972a12b

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