Malicious PDF — malware analysis report

Static analysis result for SHA-256 1765567aebe4ea36…

MALICIOUS

PDF

70.7 KB Created: 2021-02-21 23:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 113ade487861b251506a48294fb1bf38 SHA-1: ced439c15653329ebef9188addb15e5cd968eb30 SHA-256: 1765567aebe4ea3606b1291a6e4c3a3a4d168c03e2d6d1cacb46e3126fd50823
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings and numerous embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=mods+mapas+brasileiros+farming+simulator+2015 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ffcad813f112.pdfIn PDF document text
    • http://eeuuurrrrr.space/mazakidetutiruziwuzo9547c.pdfIn PDF document text
    • http://it50discount.pro/barilla_chickpea_pasta_nutrition_informations5qho.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/tegarovesopud-tujutas.pdfIn PDF document text
    • http://re-capital.ru/reporter_live_photo_bangla_video_ganj6crc.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/nivugivenovelazeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/W1xhb9l/screen_recorder_with_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/Aujggg6/65597286930.pdfIn PDF document text
    • http://hookup755.fun/39000011220e9g66.pdfIn PDF document text
    • http://oyuncuxx.com/google_apps_script_spreadsheet_classeibzn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_60260b51ad22c.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/35116066579b093s.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/vaporixipoget.pdfIn PDF document text
    • http://vereffka.xyz/1055262832m903b.pdfIn PDF document text
    • https://jakinazar.weebly.com/uploads/1/3/1/0/131070367/ddfe62377d1.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/hkojaie/pathogen_earth_science_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 5956 bytes
SHA-256: 3ee29d0febd2fb469071db1f1dbeff345df564cadc960b5ba73c098b158c81eb
font_01_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 12348 bytes
SHA-256: 58fcd06952cac85b8c4527e94031d9e417ff7322aca166c2fe97476798af1a64

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