Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36eba563efc4a44…

MALICIOUS

PDF

82.3 KB Created: 2021-04-07 13:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ffde1d709dd905f05f77366807020f76 SHA-1: 1290801da6b957c42c32f7730c4c1563603fd262 SHA-256: f36eba563efc4a44e95db03d98c152206ef6a39eb58cc04416457fec82e2729d
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 0.9995

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://botokaw.ru/award?keyword=construction+project+business+plan+pdf PDF link annotation
    • http://siwupezomejen.getenjoyment.net/how_to_lie_with_statistics_chapter_1_summary.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/68709696902.pdfIn PDF document text
    • https://deponoma.weebly.com/uploads/1/3/2/6/132696267/gofagofasavo_tonirunipe_popotevesapetuf_pifaloza.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/ec35fdf521.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/winizawadanu.pdfIn PDF document text
    • http://dikoxikikalonib.scienceontheweb.net/curso_de_economia.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/jimosijozijugiten.pdfIn PDF document text
    • https://pojewesam.weebly.com/uploads/1/3/1/4/131410485/4588963.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/64059887283.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/lujuwapufukolal.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/6716913.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://vazalavowudepip.epizy.com/bepata.pdfIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_4017231f0a1443a7b1a1028c76649bfa.pdf?index=trueIn PDF document text
    • http://kenavegolixase.epizy.com/atipia_linfocitaria.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/74546735088.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/64906606668.pdfIn PDF document text
    • http://jefebewo.epizy.com/electric_pressure_cooker_repair.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_35727f2f517b4b749889824ce3dd204b.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_527278cfa90949e08932d53601675de9.pdf?index=trueIn PDF document text
    • http://sojufuka.atwebpages.com/deferred_annuity.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_6fdf369b1095401f90b0c2ccf1ba29a2.pdf?index=trueIn PDF document text
    • https://82f7a8bd-e2a3-46ec-bdf8-dd4727f017fb.filesusr.com/ugd/a90de3_46ccf7c6e749487eb9378786e25b11e7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 5268 bytes
SHA-256: f10b21f94169974cbf7144ea6405216503d151c41f95c53dced26217d8b9930d
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 11052 bytes
SHA-256: 90c66ec2f7795ce7921c036e2535a405c77e4693c54fcdbd32358892c5eec869
font_02_sfnt_off00012d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D70 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3