Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9dc7b22cb348a6…

MALICIOUS

PDF

78.9 KB Created: 2021-06-01 08:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 09d003d494fa098da9127c31f1b17e99 SHA-1: b9101ed79d8484870c9622687b7a13b90529717b SHA-256: 8b9dc7b22cb348a629ff285db7aa47f4b14022b14c9fe2ce297abb0933557026
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=support+cours+alphab%25C3%25A9tisation+pdf PDF link annotation
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/nidelirufoxa_jisefen_xenime_tudonibibovisal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5ff95c89d13ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_600d022112558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fd96ea0e826b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_604ad0cae7400.pdfIn PDF document text
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/2374055.pdfIn PDF document text
    • https://wovadipe.weebly.com/uploads/1/3/4/4/134462462/vukudivowizos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_6068d6ccdb06e.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/fazetubib-fejuxobuli-lovazegumafaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_601470f3632b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_600f5ed9c6b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6039e1438bba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_6044973f40414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f182c727-e7c3-4cb5-860c-c7bb8722299c/speed_queen_stackable_washer_and_dryer_dimensions.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425187/sebinokibulodajele.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/75709498585.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/89737910467.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144441786/libro_aura_descargar_gratis.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/visual_studio_code_python_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7708615-9089-43e5-b481-a865ae96c4dd/jedawatisefevojojirisawuj.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/windows_10_64_bit_download_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef0a9f3-4284-4bad-8bb9-41532dc44ade/tatinutozivivuxomo.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423576/exercicios_concordancia_verbal_e_nominal_concursos.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/w/file/fetch/144438144/zeroli.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/partition_chant_donne_nous_ton_fils.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_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 5628 bytes
SHA-256: aa29d6ac3d856be61421bef27957a1dafff92413ff66de2c15f19e7f5b44dfa9
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 12232 bytes
SHA-256: 7b76f8c95f75acc4e626aa868f8a572bd457c8dcee4a6cce1381da61f19cb905