Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1f0b34437cbd49…

MALICIOUS

PDF

73.6 KB Created: 2021-05-30 16:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eb65c4ea6398c0b945da24c7875e6c1f SHA-1: dd99ad8c9393b6c4bdd7d68718e03e6015551afd SHA-256: eb1f0b34437cbd49d0ebe1392e00d147b5ae6fd82824350f1421f79e1a41ac16
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=predicate+nominative+and+adjective+quiz PDF link annotation
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/6286724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6044729133d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_601da88de2fa9.pdfIn PDF document text
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/nifozobiwal.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/vavodag.pdfIn PDF document text
    • https://vupagivoro.weebly.com/uploads/1/3/4/3/134314863/6102467e58598fa.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/finad_vufovelusumul.pdfIn PDF document text
    • https://domexuvuk.weebly.com/uploads/1/3/0/7/130740212/f7b995157cbb72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_605465351647d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6043f14d45d69.pdfIn PDF document text
    • https://pasodevoz.weebly.com/uploads/1/3/5/3/135345373/jimewad-duzusow-xosuxadojuter-rokisisexaxaj.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/7e58da28-a3fc-4b49-a8a4-a4ae02c714d4/2014_ap_chem_exam_free_response_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ef631c-87b5-40dd-a724-7c636491decb/digitech_rp500_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecce5461-bedc-4f86-a976-c33ee0b63811/70477540680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faf9303-25b3-4065-935a-9560e844a87f/ridilibipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436b216e-c15d-42f5-84fd-c109223dfcff/whats_a_good_desktop_computer_brand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb178dcc-2531-4025-a715-b8c4fc43e694/51114664684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ee5946-cd41-4bd2-a760-63c4da5ea6cd/98999583897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544a6af7-493f-40fb-a088-77879fd823b9/mit_erfolg_zum_goethe-zertifikat_a1.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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5188 bytes
SHA-256: 44d03f066e08ae0c1fbe7a98590a0e1225332c642862f30d6a62f2c04d4021e0
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10612 bytes
SHA-256: 9b967bc022ff897065d89952a3ef286e6e1b90eeb8ae8798c8705ac8c032bebc