Malicious PDF — malware analysis report

Static analysis result for SHA-256 24866749b17287fb…

MALICIOUS

PDF

96.5 KB Created: 2021-04-08 03:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98ba93f15a2a107b2d91dbde5c7da44 SHA-1: 701d03f6b9080647d63121957b9c240a4ff86391 SHA-256: 24866749b17287fb8d97fad5ed6bad44c2cdf21ba6441ac3cc19186b2c7dffd6
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm with numerous external PDF links, including one to 'bapixive.weebly.com', suggests an attempt to obscure the true malicious destination and potentially host further malicious content. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this behavior. While no scripts were extracted, the overall structure and heuristic firings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=finding+complementary+angles+worksheet
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/minodezubuzixuniru.pdf
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/8818853.pdf
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/ba719ce31c03db4.pdf
    • https://cdn-cms.f-static.net/uploads/4405639/normal_600fbf2db8ef8.pdf
    • https://cdn.sqhk.co/womafafowix/rihjcie/illustrative_corporate_governance_report_2018.pdf
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/zebake-zagaganejofujob-jadime-bitepurutasewi.pdf
    • http://wovuwukotuvoxi.mygamesonline.org/sukezotev.pdf
    • http://gosunenibunale.getenjoyment.net/83134916354.pdf
    • https://cdn.sqhk.co/kerametunal/Vhaggjf/mini_cars_nitro_stunts_extreme_speed_racing.pdf
    • https://cdn-cms.f-static.net/uploads/4404287/normal_605957cc484e0.pdf
    • https://lotijilakoda.weebly.com/uploads/1/3/4/4/134468432/vigowukeba.pdf
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fed211d71e5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/belopudevuzuza/81656887438.pdf
    • https://s3.amazonaws.com/wemazun/non_valvular_atrial_fibrillation_guidelines_2017.pdf
    • https://s3.amazonaws.com/muvemasoxaji/1779494742.pdf
    • https://s3.amazonaws.com/jemisajoda/79142133689.pdf
    • https://s3.amazonaws.com/gapivegek/womasetovenomowudakudagu.pdf
    • https://s3.amazonaws.com/fapaga/wipuzuwivepigalid.pdf
    • https://s3.amazonaws.com/gapuruxumeg/85684182498.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d44.bin
0f938d891f3e156db9084a0278b0940bb20d23976a1184745169c8b2afc33aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 5488 bytes
font_01_sfnt_off00011fca.bin
c9728b9fc1a0b532a78ddb1a3924dc5757c07917ddc9e7cd84440025fb9296be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 10336 bytes
font_02_sfnt_off00014096.bin
5ab9d2df31381f66a9e0f64285ad4a530951683d820db4c5cd02afc2fdd2d1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14096 10920 bytes
font_03_sfnt_off000165ea.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165EA 4324 bytes

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