Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c001eb9974be56…

MALICIOUS

PDF

65.7 KB Created: 2020-11-23 12:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 47ca1ad1ee2ede04d57df8ba2354ac1e SHA-1: b862ae6d1f59a4dd2c93a9a7bde595291435f503 SHA-256: b4c001eb9974be564c8fe68f3ad8a4893b72b01a3078be4656b136059574244c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=endometrial+cancer+guidelines+nccn PDF link annotation
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/pafavafu_wakoloxax_jitabudovefup_jifis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f9673cf607f1.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/009f6df5f7df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_5f934a92353a9.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/wikurixobelu/aashiqui_3_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e63545-9663-4d5a-85ac-7cf508093c9d/bronsted_lowry_base_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/26637882077.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/schumacher_se-1052_50_10_2_amp_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56596750-f7ff-42bc-9546-a7a466e73e3a/52527103706.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/gojuwewom.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/gutuwofo.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/bfa_cooking_guide_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/chuyn_t_nh_sang_word.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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 5216 bytes
SHA-256: 18a60cc12b5e65cd9ad380c0cc0df7cb10e25e2222059cc3213d9753cc5ba53b
font_01_sfnt_off0000d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E0 10680 bytes
SHA-256: 63f7575189a042915a2f149ca0fe279a9b7477c4f5bbd6714bb0b1ae5c5e5386

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