Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf2c0cfb70c530e…

MALICIOUS

PDF

80.7 KB Created: 2021-05-11 15:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b0d3fd8fda8c28146c2f5c298744961 SHA-1: 7aa9a4a402b2d04ef11f57b154403c314277743e SHA-256: 9cf2c0cfb70c530ed47d180d9d6662141c4a0b916f83b4f843030343347c26e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary function appears to be redirecting users to a multitude of other PDF documents, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=how+to+start+a+persuasive+essay+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365657/normal_603b2773305d4.pdfIn PDF document text
    • http://optalpha.com/lezituxavifokalira80kkm.pdfIn PDF document text
    • http://findssldz.xyz/kigewowejoos0w0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_60321b08141d2.pdfIn PDF document text
    • http://cabinetshub.xyz/lego_harry_potter_1-4_hogwarts_castle_gold_bricksh2way.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/forest_subway_escape_run_free_running_adventuresakpl0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_60109c4695c7e.pdfIn PDF document text
    • http://skidki-day.site/pilufiluzitasokukeh5l7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_6eedf91ec4d64c558a88f4ebd3eb0a04.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_8e3efb84c3b145bc8fed14e467b0cfae.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_0acfdddaf7bd46429bf749fae6631a28.pdf?index=trueIn PDF document text
    • http://nepupiborama.rf.gd/5709716952.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_ef064ad3b69d4f3899d29f8d4ac2def2.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_a08600f8431b458aa5e30d1b6e873c51.pdf?index=trueIn PDF document text
    • http://vegefozexus.rf.gd/ratazenivugotej.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/adding_and_subtracting_like_fractions_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/75737043458.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_6858d4509cfd4f03aca3be0a05c555e4.pdf?index=trueIn PDF document text
    • http://rujemivegelap.epizy.com/charoen_pokphand_group_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/mtg_burn_sideboard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/bojoru.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/3d_text_video_maker_for_android.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_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 5248 bytes
SHA-256: cf6de18583c1e6f8a6a81cf48ec2f8bd6316b075fdc8870a2a25d209e5b09765
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 10440 bytes
SHA-256: dbefec7cb28633e8d7b055e7c140004d18131ce6d4796c9adb58058908b7de0c