Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaaf856512aac92…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 08:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e7f81c79b7551a972db8e6f86aa97e23 SHA-1: 0585361f201a0bf561d0664cb7380a9995e595d6 SHA-256: dbaaf856512aac92960c50f625e65e62567ab51d431a040d2d2b9a426e4cb0bb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a product search, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=gooloo+jump+starter+power+bank+how+to+use PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469135/normal_5ffbc969b7122.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/bidesubababu.pdfIn PDF document text
    • http://puduzex.22web.org/the_ugly_duckling_play.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5ffda7cc5cfbd.pdfIn PDF document text
    • https://pugoxadegile.weebly.com/uploads/1/3/1/3/131379866/kafikizodozo.pdfIn PDF document text
    • http://juniwasobevi.22web.org/glossary_of_terms.pdfIn PDF document text
    • https://sulefufevonabu.weebly.com/uploads/1/3/4/3/134363738/b66daa44ef6.pdfIn PDF document text
    • http://bilapak.66ghz.com/xozozuxuvalufof.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/582766cdd54fd.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/vadanekedixulujazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://perotufusutukes.epizy.com/excel_if_string_exists_in_sheet.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/10747385407.pdfIn PDF document text
    • http://refedeto.epizy.com/direct_indirect_speech_worksheets.pdfIn PDF document text
    • http://movetusogajugup.epizy.com/finders_keepers_movie_wikipedia_2014.pdfIn PDF document text
    • http://gatinilub.epizy.com/wopimakisazivikazejolari.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/employee_contact_details_template.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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 5460 bytes
SHA-256: 388d3ddefebb394579e7aef73df114017355c3edf5bbcd94c59499a0e393cfbb
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10648 bytes
SHA-256: ffcea9790796b5641046f97ce84f8cbd70d2e3440bb68d96ca617378443d4f03

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