Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3427d0cc12cd527…

MALICIOUS

PDF

74.2 KB Created: 2021-03-22 06:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4aa55daf0e7fe38f2eebd2f7cf878a0a SHA-1: 53aa8bfc493c2d6b931d47c501d0a70eb0bc3d8e SHA-256: b3427d0cc12cd52739ca5b2cb417cb64088fcbb776e2330659e10f851fdf34cc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with link farming and potentially phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=carryon+my+wayward+son+tab+pdf PDF link annotation
    • http://dotavulilego.mypressonline.com/investment_banking_terms_and_definitions.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/6gcjfhb/wozef.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jggiyjj/phage_the_untouchable_commander.pdfIn PDF document text
    • http://tarigutese.mygamesonline.org/gesaxebojirapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_d4b9adf4e8814ceda6337c00325d13b1.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_1f8c7c750bed4027a6813eef54e9dd63.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_f299a2a7bb5d4e928950a10f3de78890.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e91faa-e56a-4e1a-a36d-8b19463f0823/sciatica_exercises_for_piriformis_syndrome_video.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_8c9101139c1545a9a1616d74d17219b9.pdf?index=trueIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/estenosis_del_acueducto_de_silvio.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_ffd8a201132f49219e9e8ecaa2bbfc29.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_cf6265e90e9245f29a817e21a89ef9d4.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_4244ddaf6abe47c99058ccc40b7ff0ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/621fa415-e3aa-4afa-90cb-bd690ec4daf1/41999582196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe5b94d-cfd0-4bc2-b5dd-ceb531dbfaa4/52094562509.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/will_there_be_another_series_of_what_we_do_in_the_shadows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182937de-7d12-4be2-8a6b-07966888fed6/xizenibagena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68dc9beb-f782-4a96-b80c-ab8fe4610000/mujef.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_bcb6cd6f46634aafb4d28a3bc5c42f94.pdf?index=trueIn 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 5392 bytes
SHA-256: 22f472190a6e361a27a2a577e2b6d6ac4b4be1b3b04358f6dedd6baebb00dab0
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 11044 bytes
SHA-256: fac032d4bb414f5896825c317e493f524190a6b78822d6596dbe1a3ab6cea662