Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4be5ef8544e9979…

MALICIOUS

PDF

90.9 KB Created: 2020-11-23 12:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a4499c70e464f0709c3592b21c1b761d SHA-1: 9d064e6c56589679d4ef005301f44cfe52bcf824 SHA-256: b4be5ef8544e99791df85b693300bcd10cbb690d30ab7ebae41416e318204be9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=acta+neuropathologica+guide+for+authors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5fab671944b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fa0535c9fe89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f90eda345c22.pdfIn PDF document text
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/903773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fb87f6551df9.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/7715232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f9e64b4e6769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/napoledunadigo/87305673951.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/lojuwad.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/85443589808.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/cox_cable_gainesville_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/articulo_cientifico_de_metabolismo_de_proteinas.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/solaga.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/nba_2k14_apk_download_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89c7daa-f06f-4de3-afae-74ce59020f51/kixedamonitivajul.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/juragetudiduxok.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 17056 bytes
SHA-256: b36f50fc97ade355732257acaf55bb5d3a6496aa6cf132a4786703a7ead2aedd
font_01_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 5288 bytes
SHA-256: ae728ae99e7c518762999116757a1f06187ee7947270e8bbbeab4962b1ec5207
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 11296 bytes
SHA-256: ea779ef86124fd71ca7f00590a7e2308bf1b3b77fa8e5057dc7e2aeb9e8188f4
font_03_sfnt_off00015012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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