Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08b7fd773ab0325…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 04:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f5e135a2e20efaf81a64facafab66fd SHA-1: f096d0ff70ea1d3ebbac29fba9a14d0ea1189c19 SHA-256: c08b7fd773ab0325a190dece8d425e9c3d1096a41bd52307b9e536c906481096
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=line+6+spider+iv+75+amplifier
    • http://mumijivamivaxij.medianewsonline.com/types_of_analytical_balance.pdf
    • https://tonaroxaz.weebly.com/uploads/1/3/5/3/135317799/pevodadage-nexigiraduxej-kopuponitavamos-puporuxikabolop.pdf
    • https://dedaxetodopifo.weebly.com/uploads/1/3/0/9/130968947/fitakurunox.pdf
    • http://fesufobototezer.mywebcommunity.org/29850949741.pdf
    • https://dodonebonobegep.weebly.com/uploads/1/3/4/5/134597525/bogerobonusudifeso.pdf
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/4d9f9a.pdf
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/1478863.pdf
    • https://cdn.sqhk.co/fexiseme/iihaNjf/jizajidewepenoxeduko.pdf
    • http://waragofekoxexaz.sportsontheweb.net/47215021840.pdf
    • http://dizurexemubegog.mygamesonline.org/oasis_water_cooler_faucet_parts.pdf
    • https://cdn.sqhk.co/mujawiru/ghEwq0Y/94801440304.pdf
    • https://cdn-cms.f-static.net/uploads/4482880/normal_60460cf59343c.pdf
    • https://cdn-cms.f-static.net/uploads/4387816/normal_603a5495c7221.pdf
    • https://cdn.sqhk.co/bupitagalir/5zgeggD/xaxaj.pdf
    • http://zukirudon.mypressonline.com/online_website_to_maker.pdf
    • https://cdn.sqhk.co/relulapezele/7kjjpsi/brh_haiti_historique_taux_de_change.pdf
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6018688875819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_13f4a4f23bcc42ab907b0feb3d78ae4e.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_ddf7e4d82322404d875dfb60c98702dd.pdf?index=true
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_195dd7f94c5c4456be8a142f9c852912.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4c864f4d14d1457bbed74a548292bc13.pdf?index=true
    • http://gozuketitara.onlinewebshop.net/25572598128.pdf
    • https://3c59ccad-08dd-474b-8af0-a42d91f20399.filesusr.com/ugd/489ff0_857759b3999a4b8fbb8d7548aa2b61b9.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_off0000dd44.bin
35f04c55e135aa8b01f39d4577a03f16600fd745be9304c075f9f678221977d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 5548 bytes
font_01_sfnt_off0000f01f.bin
484969e784f49464e3ca1479a4f409eb73edc7d2eeb38f780cf75ba1c3bda0b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 16972 bytes

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