Malicious PDF — malware analysis report

Static analysis result for SHA-256 2835dd7e15caca1c…

MALICIOUS

PDF

76.4 KB Created: 2021-06-12 04:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c30cc68e3ffe8219873ad65d76d43887 SHA-1: eb2f0b7db2afa326dc6e7c57370f4750d7d479a6 SHA-256: 2835dd7e15caca1cc54446dd2150ceb0e860efec17bf5951d522ae8e881d8918
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 0.9996

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://synerhu.ru/pbw?utm_term=tnt+cannon+schematic PDF link annotation
    • https://xesirizibolaz.weebly.com/uploads/1/3/4/4/134432563/dezudatamarala-vofowojelobusa.pdfIn PDF document text
    • https://powagaminabori.weebly.com/uploads/1/3/0/9/130969211/vogowalu.pdfIn PDF document text
    • https://sobalapufutagum.weebly.com/uploads/1/3/4/6/134601001/1ed9a90922473a.pdfIn PDF document text
    • https://xaforexu.weebly.com/uploads/1/3/0/7/130775472/89959d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lefilep.pbworks.com/w/file/fetch/145168674/39518903596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26e7180-ce1d-4b13-9bc9-4b138c562947/how_much_internal_auditor_earn_per_month.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7833623-55c9-4d7a-a5b7-73a017298d26/what_functions_does_the_left_hand_side_of_the_brain_control.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/class_4_worksheet_maths.pdfIn PDF document text
    • http://nerolelupi.pbworks.com/w/file/fetch/144842328/gadidagam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef7e957-59cc-4607-adba-e51ec1ca6106/59751374421.pdfIn PDF document text
    • http://lakejidumap.pbworks.com/f/convert_jpg_to_dst_file_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e91fea-2ae1-4cb4-9df2-bbaf0b8f8c25/arctic_king_8000_btu_portable_air_conditioner_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5968446e-56fe-4e62-b625-772bd9486ebf/duvototevuzosi.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144526437/how_to_fill_punjab_police_constable_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8877cd6-1dba-4c83-8a02-eb3282413f8e/95828619669.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_to_set_up_signature_in_nuance.pdfIn PDF document text
    • http://tipewizu.pbworks.com/w/file/fetch/144964431/gimoxekakugonesemefubobiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6bbefc-e861-427e-bc96-8bb7a60c1349/how_to_make_font_size_scale_css.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 4648 bytes
SHA-256: c7a014e7f98bd420523c296c7460791ccabfcb0fdeeabe21c9d3a3bc6d42c175
font_01_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 10392 bytes
SHA-256: 4d9a549e9263721ca180ca830d4af21e9dac7e7ce6905f24196f0de1901eb406
font_02_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc
font_03_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378