Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65ffe293fb0c29e…

MALICIOUS

PDF

72.4 KB Created: 2021-03-16 09:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e043436d12f275dad0b99704d8648dbf SHA-1: c8e55f452cf5f047d5d7558f860fe5378156c485 SHA-256: e65ffe293fb0c29e7c774b6b46157adbff0f704b5629badde571733110c8ad46
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=acoa+laundry+list+workbook+pdf
    • https://cdn-cms.f-static.net/uploads/4380694/normal_604e3b72ddf65.pdf
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6042bc79c777a.pdf
    • http://braco.ru/browns_injury_report_vs_seahawksb0lad.pdf
    • https://static.s123-cdn-static.com/uploads/4450147/normal_5fe55abeabba1.pdf
    • http://deutschebank-meine.com/airplane_pt_2_bts_free8m9np.pdf
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/7294420.pdf
    • https://cdn-cms.f-static.net/uploads/4404287/normal_60371763074a6.pdf
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/fulubuwosan-pelinipilixol-fulokizifuka.pdf
    • http://copytoshka.ru/is_the_sun_paper_out_todayfytyp.pdf
    • http://winoraama.website/what_is_the_purpose_of_the_woodcock_johnson_testgnkp8.pdf
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/savelixasataw.pdf
    • http://goladelexugezi.sportsontheweb.net/98726014024.pdf
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/7b208.pdf
    • https://suwekamepegatir.weebly.com/uploads/1/3/2/6/132682685/mufunolopag_napekufore_nutuviv.pdf
    • http://milanomoda-italy.website/hay_day_icon_meanings2rwoa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xeropizuwe/dm_full_form_in_medical_science.pdf
    • https://s3.amazonaws.com/nitajosasa/tisopisubekedoxasuvu.pdf
    • http://xevijojikutep.onlinewebshop.net/zukexazumijekifu.pdf
    • https://s3.amazonaws.com/xarojapi/best_buy_irobot_roomba_s9.pdf
    • https://s3.amazonaws.com/buwosevax/7463181446.pdf
    • https://s3.amazonaws.com/nakevoja/vatulilejamamajeritem.pdf
    • https://s3.amazonaws.com/fonibinaraj/zemixibexawerowifo.pdf
    • https://s3.amazonaws.com/xozeb/75959961488.pdf
    • https://s3.amazonaws.com/rubidokezive/how_to_complete_six_sigma_certification.pdf
    • https://s3.amazonaws.com/visagogijulep/how_to_study_for_step_1_in_2_months.pdf
    • http://kojuvurapamox.myartsonline.com/the_monkey_king_2_release_date_in_india_in_hindi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d096.bin
8bc987dd3a4405eee1e40bc0cf4378cbb30053eaba90bc50ed9b8a838e3fe31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 5300 bytes
font_01_sfnt_off0000e2b3.bin
34a5cd282062c03a6eb4c23410614550bfc4edb6d13cfbd55c331da0ea40bb39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10112 bytes
font_02_sfnt_off00010543.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 4324 bytes

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