Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bda50cd2d9e826…

MALICIOUS

PDF

83.5 KB Created: 2021-02-25 03:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b66d06e44aee48a58ed925b6b3ccb00 SHA-1: 2c9c573bd5ce093e19c2a6d8964c8da04437942b SHA-256: 19bda50cd2d9e8260a4ae97a61a5a93b0bbc9f4790964a9bd9144f29594d6a74
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=physical+therapy+treatment+scoliosis+adults In PDF document text
    • http://medicalpracticementor.com/patent_search_analysis_report_psar_11j2n6.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/69693220084.pdfIn PDF document text
    • http://sigasebilo.iblogger.org/blood_bowl_chaos_dwarf_guide.pdfIn PDF document text
    • http://healthyforczechrepublic.site/bhosari_midc_manufacturing_company_l9tl87.pdfIn PDF document text
    • http://www19216801.site/nook_hd_bntv400_charger0ow84.pdfIn PDF document text
    • http://bipiraxas.iblogger.org/21525796075.pdfIn PDF document text
    • http://berozava.iblogger.org/adobe_photoshop_cs6_camera_raw.pdfIn PDF document text
    • http://vezokikawelin.iblogger.org/povafusobitufogesetamif.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/mijewavumubuxo.pdfIn PDF document text
    • http://bathforlegs.xyz/resume_format_for_chartered_accountant_in_wordpyicw.pdfIn PDF document text
    • http://asia.kiwi/53926594725guueg.pdfIn PDF document text
    • http://shoop-fk.ru/daneripijedafunudekojabibpte2.pdfIn PDF document text
    • http://prizinsta24.space/takemefuveloxitupatikz0z16.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/4a43b2b.pdfIn PDF document text
    • http://clientbluebadge.com/xeruvanuletotukicyfw5.pdfIn PDF document text
    • http://christinaanddavid2019.com/nufifosaxorunuxasf3td.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/0317238893.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://xetorofowuwid.epizy.com/cara_kerja_obat_antasida.pdfIn PDF document text
    • http://nebopujewewap.rf.gd/dusulejerowume.pdfIn PDF document text
    • http://jidojig.epizy.com/spelling_worksheets_for_6th_graders.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 5296 bytes
SHA-256: 99c479842cac55f88fb636664bfa698613208f12cfe016b63101c25615234c3d
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10780 bytes
SHA-256: 495c7ae135a02cebbb18c098be4d509757d7a1fddccb1fe0916481392eca2231
font_02_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f