Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef9b22467692e97…

MALICIOUS

PDF

82.6 KB Created: 2021-04-19 05:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7d27d2f167fc4cbb0c4875442f58cd5 SHA-1: ef2782f9934447acd555451c50b311016c22a0f4 SHA-256: 4ef9b22467692e9762c9d02ebb93d7e2a32512f67c623d528f53e8af4e42da07
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Forgotten realms history book'. The presence of numerous PDF links, including one pointing to a potential second-stage payload at 'https://cdn.sqhk.co/zudilubal/dijxyia/tawewotorafifirogu.pdf', indicates a phishing or malware distribution attempt.

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://ponafet.ru/strik?utm_term=forgotten+realms+history+book
    • https://cdn.sqhk.co/zudilubal/dijxyia/tawewotorafifirogu.pdf
    • https://cdn.sqhk.co/bepoweruga/egftjhf/download_hd_wallpaper_iphone_xs_max.pdf
    • https://cdn-cms.f-static.net/uploads/4478148/normal_602ed0dba2f04.pdf
    • https://cdn.sqhk.co/givogaduta/gdgijaU/kuguzipitapexavadoniz.pdf
    • https://cdn.sqhk.co/pulovafafita/PjhJidQ/free_jelly_bean_coloring_pages.pdf
    • https://rumunalitivera.weebly.com/uploads/1/3/4/0/134041361/8b8abd49c7c3.pdf
    • https://cdn.sqhk.co/sunomedude/lhiihje/gaming_wallpapers_4k_for_mobile_download.pdf
    • https://cdn-cms.f-static.net/uploads/4385020/normal_602a72962cf1a.pdf
    • https://cdn.sqhk.co/pemoxeriko/bhahjia/street_outlaws_cash_days_2020_nebraska.pdf
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5fd7878aaf8df.pdf
    • https://cdn.sqhk.co/ganuniwiku/bXjgejc/rc_race_cars_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5fdc4d0fce210.pdf
    • https://cdn-cms.f-static.net/uploads/4370068/normal_606a723e06b93.pdf
    • https://cdn-cms.f-static.net/uploads/4423442/normal_60159aea3b5d7.pdf
    • https://cdn.sqhk.co/bulunazi/iiihjfb/2887244589.pdf
    • https://cdn-cms.f-static.net/uploads/4490256/normal_6029ec4ba1489.pdf
    • https://kugavulaxux.weebly.com/uploads/1/3/4/4/134454690/tojivafafagizasi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/kitofobatifexof.pdf
    • https://s3.amazonaws.com/telasebisu/98502176252.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_off00010212.bin
c53de0c9d7882c24672d4f46bfdaa0cd28dc1939f266bae03ba373658d1ada2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 5360 bytes
font_01_sfnt_off00011435.bin
f1a3e521b1107f9975a119a114fc6de1f278bf76aecf18ef80f0cfb3dfb52aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 11620 bytes

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