Malicious PDF — malware analysis report

Static analysis result for SHA-256 1633bec5925a7d8a…

MALICIOUS

PDF

71.5 KB Created: 2020-11-20 11:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5780a7b2e48bedc4c170605fa5c10228 SHA-1: d83bebab2a3d378a88093ef12e5f89ed0c1c95b6 SHA-256: 1633bec5925a7d8a15dd4b3cf22aa8ad9fbab8182789d8a7e85d338d51973b28
214 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 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 0.9998

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://traffmen.ru/strik?utm_term=clinical+sonography+a+practical+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_5fb670883ce76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_5fad85b09addf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5fa8a48286f13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5f9882c410d32.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/samupekawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fb7695d38a4a.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/sefiwegegagu/les_hommes_de_lombre_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/petroglyph_animal_hospital_abq.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/lozamajusirenir.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/doobie_brothers_albums_charted.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/super_duper_game_cartoon.pdfIn PDF document text
    • https://s3.amazonaws.com/mejediparaxi/stop_think_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/9302187989.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 5340 bytes
SHA-256: 97e006f0162981e32b10c84f367195f3b2ca8337ac366674ef8a0caaf4392f02
font_01_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 10460 bytes
SHA-256: 9fc3412d3c701b5a8565076170515e7d5e32a8f69f736a4a1841f26e11955469
font_02_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16496 bytes
SHA-256: 97ff1fcb60ed7e668d2852c3986ed51352c02454a214235d0ec8f2edb3267f12

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