Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d6017f7292a28c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-22 10:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2dd2d864acb339aa6f0d0234dbd898 SHA-1: 12cc5f9cd6365bdf68c853d8e5a91a9012c03821 SHA-256: c8d6017f7292a28c155f1536aced660e6aef1f6cbf0247fdbccab000fc8bf711
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=agriculture+notes+in+tamil+pdf
    • http://fortuneocredit.com/toliwinoyekep.pdf
    • http://formverifiedbadge.com/80976192145d6n82.pdf
    • http://homiak.fun/faguneip3t1.pdf
    • http://rawenspant.online/92327803676ahcsl.pdf
    • https://cdn.sqhk.co/tazakabebilo/h6ihahi/north_east_counter_terrorism_unit_jobs.pdf
    • http://erogan-encolumbia.site/best_chest_strap_heart_rate_monitor_for_pelotonojcj7.pdf
    • https://cdn.sqhk.co/savunowudob/bhbid1f/poe_elementalist_build_3._12.pdf
    • https://cdn.sqhk.co/givujelised/sHji96l/netflix_login_account.pdf
    • http://genoray.pro/kiluremopopizanausbme.pdf
    • http://imm-shoes2.club/download_longman_dictionary_offline_apkqyxob.pdf
    • http://silver35.ru/what_is_a_laboratory_equipmentdfhm4.pdf
    • http://gogotmif.space/11985514647afazh.pdf
    • http://idealicaitalia.website/tukopuxapiguderanajesz60ns.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_d3e66ccd8f6f4a4d9f87586753579d0f.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_a248cf13a4024d5aabaf7283339dea3c.pdf?index=true
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_c386ab13b28b48c58e8676d472dd3f17.pdf?index=true
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_1836c4b0af194bdf9a43131cc8ccab44.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_17425669d2e64381b6aebfa52b495caf.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_583b80d7fb214011be6a07de2962a1a5.pdf?index=true
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_ebaa87436aef47fb8afabe7d7128d264.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_off0000e3b3.bin
fd67a2fbc33c2a80df69b113ad68f338584d255b91c6c9ffb5cd0b5abcb771f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5464 bytes
font_01_sfnt_off0000f638.bin
89a134153af8b89ed1ef935ffbc8e906f1f62fd98854913411c67e6a0db3b66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 11256 bytes

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