Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbce9b54961d277…

MALICIOUS

PDF

80.1 KB Created: 2021-01-10 16:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3db3678c6b2f1c406e31fa28cd96a2f6 SHA-1: 30a4382761eb99341d6b643b99557dac35b3fad6 SHA-256: 9bbce9b54961d2775084fbf72d16c5cbd3736ea24f6ea682ba6e6d6d66952d0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially malicious or deceptive content.

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
  • 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://traffnew.ru/123?utm_term=mp3+player+with+speakers+for+toddlers PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/phjiijb/horse_coloring_book_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/8jbcfjj/cooking_fever_hack_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ginijetemepa/hip08jj/chess_openings_book_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/jakabapewuv/plnhfjC/97877686863.pdfIn PDF document text
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/6604706.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/63QpVZj/xorodegewale.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/4UT1au3/grow_zombies_mod_apk.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/domegagowevag/judgmental_sampling_methodology.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/obc_caste_certificate_format_for_central_govt_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/xugozibum.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/problemas_resueltos_sobre_caida_libre.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/consequences_of_bullwhip_effect.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/37406037582.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/template_power_point_sejarah.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_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 5556 bytes
SHA-256: cf5b36909851bc6c524e8409610f2764b14c216537076ad3f0ba77a0039862e7
font_01_sfnt_off00010e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5B 10756 bytes
SHA-256: ba5a5f11428685764c9a81082ee145eba110a8c3040804110aa143baa707bf4c

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