Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4129e5a7bfcc15c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-03 04:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 332893f48316cafe510a9f9363575664 SHA-1: 93b04c2fa6966e4920b24be9cc3e5f60e7526ca8 SHA-256: c4129e5a7bfcc15c9bfb3686285f8e8e750449a9ea38eb2f0ad80b465af4eff3
156 Risk Score

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-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://nipisod.ru/wix?keyword=hummel+trumpet+concerto+3+pdf PDF link annotation
    • https://cdn.sqhk.co/moxibusas/dhf8ifo/sojunituvabinabinom.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/AgfMGiz/66804889406.pdfIn PDF document text
    • http://jexemukanofefoj.iblogger.org/rijesunaliriviji.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/hhjgqOq/418130547.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/H7hcjiF/drum_set_price_philippines_olx.pdfIn PDF document text
    • http://fridgeservice.ru/how_do_you_calculate_turbine_efficiencyapmpq.pdfIn PDF document text
    • https://cdn.sqhk.co/dekawako/Mwijtgi/3_tier_wire_basket_wall_shelf.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Sgdvwij/lepasofunonaxib.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/7hcjggc/13677432189.pdfIn PDF document text
    • https://nowabarabowuxo.weebly.com/uploads/1/3/4/3/134319250/014cf28d1c96f.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/sevozikutumetim_midelolevisapaz_sulinanixasiro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizujiton.rf.gd/what_parts_of_new_york_are_dangerous.pdfIn PDF document text
    • http://nujidurib.rf.gd/93807392975.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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 5040 bytes
SHA-256: 1e4d95657d38544967aede394db8c24910f34843d370d42f40cb91866e17be0c
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 9996 bytes
SHA-256: eed362fa37bc43ae3cbb69d7e0686b9b3ea18b47a1cf0d1c8ce9fc94b3cfc26d