Malicious PDF — malware analysis report

Static analysis result for SHA-256 004327eae5c10435…

MALICIOUS

PDF

102.2 KB Created: 2021-03-17 17:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6df3e476af409994c5b920860f8413a8 SHA-1: e2b937a547f3a0de0ea070c6cfaaf844c7ac8764 SHA-256: 004327eae5c10435c7ba9833681f62d719c732ae412991e491be092a99874703
196 Risk Score

Malware Insights

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

The PDF contains multiple suspicious external links, including one disguised as a "CNC programming examples with drawing PDF" lure. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of numerous external links, some pointing to potentially malicious domains, suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://mezovuduw.ru/wix?keyword=cnc+programming+examples+with+drawing+pdf
    • https://cdn.sqhk.co/gizivapejoko/1je7hfT/18220690940.pdf
    • https://cdn.sqhk.co/zifeduwa/eRYgfjf/mobile_service_coaching_centre_in_madurai.pdf
    • https://cdn.sqhk.co/giwitosak/mQVBZcY/lusizariporisu.pdf
    • http://lnstagramcentre.net/what_are_the_characteristics_of_systems_engineering40udv.pdf
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/tejerotavodo_pisegadu.pdf
    • https://rowevopa.weebly.com/uploads/1/3/1/8/131872281/mifare.pdf
    • http://biomaniix.website/totubomojenovekivetemsewp6.pdf
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/d4fc84a20fd.pdf
    • http://securityofusersdevicesonline.site/kenawokagagugifogoty2tdh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotitibekovi/lupazilepifu.pdf
    • https://s3.amazonaws.com/rufonali/87548120540.pdf
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_84a324be7ce34cb8a5e770b711ae79e7.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_247305180a364fabbec074ad2594c60f.pdf?index=true
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_5b5ef8e60eab460b97aa2dd6692a9213.pdf?index=true
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_daab1031d5994abc8a6c37917e3fb088.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_0d4ee1be7b354e6fa8c3ad7fe5bd88d2.pdf?index=true
    • 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_off0001527e.bin
c1054e2a7735e81b92268211da9a151872810c5943fc5eb6bd5eaafa8576286c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1527E 5636 bytes
font_01_sfnt_off00016594.bin
a156de7edb8054bf46489605d1e6481be34e5665db1ca3f52e2b8c8105e39b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16594 11380 bytes

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