Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a24d326e20e0e4…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 14:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9f0880dbef3a4e95d272f5c2cedf31bd SHA-1: 5374245d666d5fcb19a5a2432101dc1b19b3d06a SHA-256: 61a24d326e20e0e46cb105fef3d174e21db581e65fb7935883470fb87a4303cb
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 0.9997

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://gimoguvi.ru/strik?utm_term=iso+9001+revision+2015+lead+auditor+training PDF link annotation
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/3503659.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/68772812564.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/7368053.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/nuzinexisoj.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/7390375.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/9c189655.pdfIn PDF document text
    • https://fejavuwuvumago.weebly.com/uploads/1/3/0/8/130874007/nivirikoranu-begutosevepefam-nimedogigav.pdfIn PDF document text
    • http://zanapipok.getenjoyment.net/asme_b16._9_latest_edition.pdfIn PDF document text
    • https://rududevuguwufo.weebly.com/uploads/1/3/4/0/134097114/eb577d10854.pdfIn PDF document text
    • https://dugigezulafi.weebly.com/uploads/1/3/4/8/134898894/fajexigifafoj_loruzokowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirexadugimog.atwebpages.com/common_english_sentences_used_in_daily_life.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_2698e926f2d14c33a321dc25b97df986.pdf?index=trueIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_bd91262d3ff44540afe52ec914ba344a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/the_omnipotence_paradox_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/carl_sagan_quotes_science_politics_religion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0d87a6-778f-47bd-993b-46bbe5d3b366/how_much_time_it_takes_to_write_a_screenplay_for_a_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/citizen_eco_drive_nighthawk_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c174e6-9330-4b08-9ec6-b1de5c2fb35a/wijarewew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb88a02-dedc-47b7-a2b7-d1e38cbc52a3/3221168317.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_a6bc0df430a1440e898f9dc091dcf5f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98790c96-d088-4ca9-95af-671c6b12f38a/writer_of_wizard_of_oz_book.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_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 5596 bytes
SHA-256: 06d3b953c68c38b9eadb088ee432f2dd810a6024ebb10f933bcc8c2ae436603a
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10752 bytes
SHA-256: 3f450bcfeb29048bf3d8f922dd33f7d9c1be6481a543cf52c33715c545dab5d8