Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d48d103f11fe228…

MALICIOUS

PDF

71.7 KB Created: 2021-01-08 15:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f0587725d0d87da7d7b67e16d8e2fad SHA-1: d59a7b0496efa8c7e50e933b54cb2cde5dc0ce52 SHA-256: 9d48d103f11fe228b756982389bb97018e8dcbf2d26e01c16ab6a26372f7f4f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to S3 buckets and other cloud storage services, suggesting a link farm or a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to disguise malicious content within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/aws?utm_term=hawaiian+birthday+party+invitations+templates+free
    • https://cdn.sqhk.co/xezojutatow/cgc8sjd/gotomeeting_view_attendee_webcam.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f918d5b88b32.pdf
    • https://cdn.sqhk.co/jakufomego/Yjilia0/costume_stores_open_near_me.pdf
    • https://cdn.sqhk.co/duburijudi/khajdif/pikowejod.pdf
    • https://cdn.sqhk.co/nezerozara/giCijgf/vumupafadofuxi.pdf
    • https://cdn.sqhk.co/javeduner/ifhiagi/nufarezobomofatoxapaz.pdf
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/2bd8935b0cef4b.pdf
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fbf6265cfbed.pdf
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5fd3bb741e5ab.pdf
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcf510381800.pdf
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f9307415bfef.pdf
    • https://cdn.sqhk.co/jabosuve/xqifgex/benopaxovav.pdf
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/wotiwosolo_gatedupuza_bodumasofol.pdf
    • https://cdn.sqhk.co/fipexuwebo/jiv29hf/can_you_escape_1_level_6_walkthrough.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukedil/47530587842.pdf
    • https://s3.amazonaws.com/zizene/mugafuxobidi.pdf
    • https://s3.amazonaws.com/pulujolatepuv/gavuvofexuzoxu.pdf
    • https://s3.amazonaws.com/gitipelut/tafsir_al_quran_melayu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da88.bin
de26417ff5c1ecd98e9d44ad745711610f85f9c39ab03c393b6ce07479320e71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5636 bytes
font_01_sfnt_off0000ed98.bin
59fc6a239af0699e97681c988dc11a507bee6f2cb93908637d7271546e2ee7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 10388 bytes

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