Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f11535740231ef2…

MALICIOUS

PDF

124.6 KB Created: 2021-04-09 07:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9216096232a1a47b1336514a2a929278 SHA-1: 9886d83e39284254cdf29676ddde1229fa426788 SHA-256: 1f11535740231ef278fe1bb6ec57de38c0df31a965cf03821f2203eb306fc27b
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9675

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 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
  • 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://midufefew.ru/strik?utm_term=herramientas+de+comunicaci%25C3%25B3n+para+personas+con+discapacidad PDF link annotation
    • https://tizojutatow.weebly.com/uploads/1/3/1/4/131406606/watororizagedinufupe.pdfIn PDF document text
    • http://beliyden.xyz/h1_racer_rc_plane56zin.pdfIn PDF document text
    • http://bridgecommerce.com/4877403827lcuwl.pdfIn PDF document text
    • http://presalon.xyz/audio_beats_pro_2._8_apkntsy0.pdfIn PDF document text
    • http://viresomal.iblogger.org/how_many_formulas_in_chemistry.pdfIn PDF document text
    • http://eu-study.ru/nasb_life_application_study_bible_indexedmqixq.pdfIn PDF document text
    • https://rudoliretumuw.weebly.com/uploads/1/3/4/8/134861944/gogulavubepizu.pdfIn PDF document text
    • https://tenuzovew.weebly.com/uploads/1/3/0/7/130740022/bobitasakorenorerogo.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/3798495.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/Ydibbjc/strike_fortress_box_apk.pdfIn PDF document text
    • http://hidver.com/the_satanic_rites_of_dracula_english_subtitlesle2kl.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/jujotituxej.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/fedogupepumeva.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/siegcgf/11197300507.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetituri/gingerbread_man_book.pdfIn PDF document text
    • http://vuremekewema.rf.gd/difiwizofin.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/south_jersey_industries_annual_report.pdfIn 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_off0001bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD27 5164 bytes
SHA-256: 3e5fca919460367e00a9dda9b5c82b192e1a8d0cf068a30f0cd579d0b769afc7
font_01_sfnt_off0001ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE4A 12776 bytes
SHA-256: 78f7c12b9a0d600faa530fa33186db38777e81068806b9979199b5329cd2aba7

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