Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd0103cff3aff77…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 02:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bf998707499033024f3b4fa79a82dfda SHA-1: 60d9e124d02e6c8600faaec2ef7cd3a194abd730 SHA-256: cbd0103cff3aff77c978d1c570e723af14989250b4c2e83a6737281b7ae9a0bb
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 are dynamically generated, suggesting a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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.
  • 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://maypoin.ru/wix?keyword=remington+branch+wizard+rm0612p+manual PDF link annotation
    • http://sobuvide.mygamesonline.org/fujum.pdfIn PDF document text
    • https://toxedozopofezi.weebly.com/uploads/1/3/1/4/131453782/3886414.pdfIn PDF document text
    • https://pafokosunokiv.weebly.com/uploads/1/3/4/8/134860442/afff3d530d5.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/59952490218.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/how_to_replace_oven_door_glass_kenmore.pdfIn PDF document text
    • https://vimujagu.weebly.com/uploads/1/3/4/3/134306096/8423282.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/vemowukogigurapo.pdfIn PDF document text
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/wobavemigum_wuribupamufun_pafawozuk_sepedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5fc8f1d107caa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5ffa7f5185a57.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/rojupiguxixapenona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_5fdc415672678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuboki/vefopofovuratasegeve.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_d48a08288b9f4529a0a50967a7dd983d.pdf?index=trueIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_38cad510375a417faf3b282fcf973467.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_828b5e449744408c917a445907a4ddf4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/musugipos.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_66052e64f7794e508a9beed4f001c755.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_58527cb5fc5d4a34b249666c63fb6d95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/40411994879.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/how_to_become_a_medical_writer.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/68645343378.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/flight_of_the_bumblebee_clarinet_and_piano.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 6080 bytes
SHA-256: 41304b923e3e7b653f5ab71714fbb69fef5743a2851dda0b28616309bc4343dd
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 10784 bytes
SHA-256: f259c788babb05f6d7e76542d54884339316348fbf9904939bcc4bfaec3af894

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