Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf7d03b1fa119a7…

MALICIOUS

PDF

80.3 KB Created: 2021-03-31 04:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a82dc109a8fe5cf444b7e5c0e84d97ae SHA-1: 2798bb70a3cb35a5a6805b3f16b9578a55b00ae0 SHA-256: 3bf7d03b1fa119a7817d1e760e9dfed137c9e18f678d7db2528e0bb5f9546274
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://jacksth.ru/wix?keyword=bill+nye+chemical+reactions+worksheet+key PDF link annotation
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/figozaj.pdfIn PDF document text
    • https://wuviruwex.weebly.com/uploads/1/3/4/7/134766268/1327693.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/nigozavarikuk.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/3310947.pdfIn PDF document text
    • https://vawigaxonisas.weebly.com/uploads/1/3/1/4/131438461/zitomolam.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/valebokosu_rawirezalile_kavomifeloga_zusemose.pdfIn PDF document text
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/e294924cee111a.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/fadokaxizidawi-nawanuwerose-nokurot-sowibameni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_42263343e10c4fbda5c4b9f1863a2f75.pdf?index=trueIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_4fd03922321644a1a5893c1347f6edaa.pdf?index=trueIn PDF document text
    • http://kojevas.epizy.com/primary_school_english_books_free_download.pdfIn PDF document text
    • http://bolomubimuga.rf.gd/jotul_f500_prix_neuf.pdfIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_cbb9e0c7a061495794ef5fa818aeb595.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varolexexus/tukanijotojedokeger.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bafg_antrag_zusatzblatt_zum_formblatt_1.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/bunuju.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_dfbb3ab467cf4390b9492505d64df8d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jigezilor/tefogowipabof.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/technical_interview_questions_on_c_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/gerizibefizofaberixotuk.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_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 5348 bytes
SHA-256: 755960b1a58e4d5c30fb79b771b52bc12808e11e668a82348ffa12ada1cd85da
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 11692 bytes
SHA-256: 2c604abcbc5540363443759fffee1229758d30b652cba1f516c5e57c81917e71