Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e74e481c2bd329…

MALICIOUS

PDF

70.3 KB Created: 2021-05-08 14:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a394f8776b779a93db34c84a75dc9c3 SHA-1: b179c1304f3f7c4ec0bf9c1ab7f4c19c8c40f89d SHA-256: f0e74e481c2bd329ff401f66748b8f9b92bb99c99e2ea7b1eb19148febaa0027
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The embedded URLs and the heuristic firings strongly suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=laramie+project+monologue
    • http://lomidal.mygamesonline.org/wupixozaf.pdf
    • https://cdn.sqhk.co/vejuwipem/hGut4gi/zalo_apk_appstorevn.pdf
    • https://cdn-cms.f-static.net/uploads/4368758/normal_60339e97c2825.pdf
    • https://static.s123-cdn-static.com/uploads/4465545/normal_600750af00db8.pdf
    • http://tisejamebip.sportsontheweb.net/aprendiz_de_brujo_alexa_mohl.pdf
    • http://kamikofonem.mygamesonline.org/administration_of_criminal_justice_act_download.pdf
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/8774817.pdf
    • https://cdn.sqhk.co/genamudazunu/ihjdjbX/bowling_near_me_now.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/vavevozeso.pdf
    • https://static.s123-cdn-static.com/uploads/4403824/normal_6003e78de83e0.pdf
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5ff151a1c9f66.pdf
    • https://dorenezawux.weebly.com/uploads/1/3/5/3/135383086/651835fa6670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_c1da86fcdc2249fd8a889fd09aeb8ca3.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_a5d7beb997124e81865600edcb86f963.pdf?index=true
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_515b95bd16c24a9e831d6b5839259ee4.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_f3bf037d47fc46e193a88edcebe4e2a9.pdf?index=true
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_e213e48afc7043e18418f9965b6797d5.pdf?index=true
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_605f49bdca90446abf58b0a3657266b7.pdf?index=true
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_89a39e7771cf409db8b8fb62d7da8675.pdf?index=true
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_b0e56afad76b4cb3bb0722b501764039.pdf?index=true
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_caeb3d639b8c47de8ab23c3376ae52d7.pdf?index=true
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_8b63a883074d49b9b81a03b5ee018f80.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_off0000d688.bin
e4e3a9d31d74adebab8adc70822d09c20de983e2dbf05cbdd1b4ab63d86aab43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 5092 bytes
font_01_sfnt_off0000e7ce.bin
b29a81f6be149509200e2b3dfda686ecdc603d8f70692f4817eebcec54c8d2a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 10660 bytes

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