Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e16c06708f2399…

MALICIOUS

PDF

80.8 KB Created: 2021-02-13 20:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9f0f384436b5cd3e5a7c1e909ec29606 SHA-1: 0bf66f600ebca9cd3969714e9a5b5ae22ce28f60 SHA-256: 52e16c06708f23999f331102b0c9caee30f88bb350ed4566fa87dfcc19fae4ee
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier also strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/aws?utm_term=operating+lease+asset+on+balance+sheet In PDF document text
    • https://cdn.sqhk.co/bizujutenifo/ckgfidr/faxojilulutupugosegiwaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/1mgiehd/974803673.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/a1idha9/youtube_to_mp3_iphone_app_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/BieiiNO/39275251483.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/ieWOhi6/7044563867.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/jgcBWW4/defewimajejosuxiviva.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/1iciijg/electrical_wiring_diagram_software_open_source.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/NKhgVTT/40209833860.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/Y9gfjh7/tuner_gstrings_app_store.pdfIn PDF document text
    • https://vowevabejera.weebly.com/uploads/1/3/0/7/130775986/lakosupoxazulev.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/netinuwa/99181182763.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/5_point_scale_printable_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/aadukalam_mp4_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/nonawujesirafexuguv.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/dodging_tables_2_to_6_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/the_chrysanthemum_and_the_sword.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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5360 bytes
SHA-256: e491361759c7b1ca373df0543978ef599e7cf7533efb2f024ea4f762c7558d0c
font_01_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 11232 bytes
SHA-256: 1a5ebc405152efe9444646bd079d489ce6da318b6db5f2ca2f70a0fe4f516b35

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