Malicious PDF — malware analysis report

Static analysis result for SHA-256 d755aecfe8b462ce…

MALICIOUS

PDF

83.6 KB Created: 2021-03-18 17:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6286926ea9907eb06783179b8303428e SHA-1: 2062d19ecaf4c92827864082f6826c8306ab7c92 SHA-256: d755aecfe8b462ce4e104c0faafb71b02ea0e8eb63cc839ae762131756c4e83a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'golowaki.ru' with a 'boss+ve-20+manual' UTM term, suggests a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', which can be used to generate PDFs from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=boss+ve-20+manual PDF link annotation
    • http://zafikapasipugog.medianewsonline.com/what_lives_in_a_rainforest_ecosystem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ffbd0fd3f03d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461497/normal_5ff5c0db87d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_602236e7593b8.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/the_couple_next_door_novel.pdfIn PDF document text
    • http://bagidopivulo.mywebcommunity.org/engg_drawing_book_download.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/8511143892.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/54247417208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454054/normal_60084f50cff55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_6029929d05bbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_e82855ce6a7b4e8e8c1779518fbbde07.pdf?index=trueIn PDF document text
    • http://bagugexasorip.myartsonline.com/77142585917.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/38339311186.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/angelcare_ac401_recall.pdfIn PDF document text
    • http://wewamamewiler.atwebpages.com/inteligencias_multiples_definicion_y_caracteristicas.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/deduwixakegemaferolalixoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602861fa-aca9-4c8c-ae6d-d36696ca945b/volume_of_cylinders_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d4f679-6422-406a-90ee-9d1bd9a4fa63/3993660094.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_2e44c6eedaa647a7943049fca405a55c.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_6151cc830ce3469ab1e6364f207132a2.pdf?index=trueIn PDF document text
    • http://kalogoraretupo.epizy.com/movie_tamil_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b7effd-3a46-423e-89f2-52c8af3af2dc/contrato_alquiler_local_comercial_2019.pdfIn PDF document text
    • http://riruvilanofaz.rf.gd/popilimuvasadonulopak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b07c5d-56a3-4d71-b420-2ccaae7ac132/how_to_measure_cubic_ft_of_refrigerator.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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 6292 bytes
SHA-256: 4deea6921374fbd7103bbbd73f99804c89b13601fa1b56992181cdbecb1f5d5e
font_01_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 5152 bytes
SHA-256: 5a5d4a8a00b63e67b49ad238b51f5c14a9d862d9ec56919695456debd0b63e3c
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 12824 bytes
SHA-256: 61cf7f1671c16d337ea4548dcf2b3ea89a71b823f3ab8047da684836f4aba681