Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa807836519b9ba4…

MALICIOUS

PDF

69.8 KB Created: 2021-03-15 16:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bb687c4309b98fd5f2cfef6f9b6580a7 SHA-1: ab300d3666f6ca630aa130ce44b1477bf2df6520 SHA-256: fa807836519b9ba478a336681551baf7a943e533f2f9b687592ca9b44f4abda1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=no+logo+ii+stripped+lower+receiver PDF link annotation
    • http://remuzifef.22web.org/board_meeting_attendance_sheet_template.pdfIn PDF document text
    • https://sokifavobal.weebly.com/uploads/1/3/4/5/134514189/9778054.pdfIn PDF document text
    • http://jigatinapa.22web.org/zodezusixikovomow.pdfIn PDF document text
    • http://fodosokidorakig.22web.org/laperozileres.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/8ead012915e04b.pdfIn PDF document text
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/697023.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/foriri-mipunitisevosig-tewed-zutufevinatawol.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/jimerosasup.pdfIn PDF document text
    • https://muwudenejudazo.weebly.com/uploads/1/3/4/6/134677543/e8421a13.pdfIn PDF document text
    • https://dobumixil.weebly.com/uploads/1/3/0/7/130738680/e44b1.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/voropa/m_hnh_lean_canvas_l_g.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_f55eacdfb5c244b198252ecd00f1f7f7.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_574eabbec1cd4b4694a89f735a0ae4d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/byu_you_will_be_found_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/wisazirukasuwofegoma.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/54591046528.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/db_legends_apk_mod_1._36._0.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/preschool_classroom_management_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/geometry_worksheet_2-_6_geometry_proofs_answers.pdfIn PDF document text
    • http://jarunotaso.rf.gd/binipibo.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/28790201415.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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 5152 bytes
SHA-256: 38500338889ab9393696b9315cc596cd24540735bdf34b50277c3cf1520ccab6
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 11552 bytes
SHA-256: 5e973593c9b3b4051c7db683c6a32cd8992ab06ade2f019125a822784338067b

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