Malicious PDF — malware analysis report

Static analysis result for SHA-256 4825b313f420a6df…

MALICIOUS

PDF

88.8 KB Created: 2021-05-24 19:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 679621377be1ca1000f88c890120e20b SHA-1: d6e4630212b96517275657ce074cae24f7ebf0c9 SHA-256: 4825b313f420a6dfb61523d3328919d6a3728fb621b1ea61eaad59db7a09e0aa
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 pointing to Weebly and S3-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://fokemale.ru/wb?keyword=how%20to%20say%20thanks%20in%20mandarin PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fed3bec119e4.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/pewul-tofeza-loxudoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_60306d78cb4a8.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/zesawomirupebif-fuweki.pdfIn PDF document text
    • https://kazikuxixaremu.weebly.com/uploads/1/3/0/7/130738513/nadopuzobego.pdfIn PDF document text
    • https://mugejonisisekof.weebly.com/uploads/1/3/1/4/131437633/fe97fbdf.pdfIn PDF document text
    • https://gedibaforajipet.weebly.com/uploads/1/3/0/8/130874683/pusizo_lemakedep_wubodegiz_puvedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_606eaadb24504.pdfIn PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/titutilafotab_bisodarefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_6055c59f8d978.pdfIn PDF document text
    • https://rizowexerezo.weebly.com/uploads/1/3/4/2/134265486/lunigaval.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/velenupojipabizeso.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/dazawojob/7th_grade_ace_math_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/technical_writing_certificate_course.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/58255201810.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/80161477623.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/iptv_cho_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/64882182285.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/lerud.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/notomufubimo.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/xarugono.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/67486987341.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/78980636190.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/taco_bell_power_menu_bowl_chicken_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/supovupivuzibezuvodebu.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/giduzusitedujileweluk.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/yosemite_valley_guided_tours.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 12660 bytes
SHA-256: 9d798c56d6241a668bcafd16f270b74a9319b73761c29ba4344828f14108dc0f
font_01_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 5252 bytes
SHA-256: d6747b5820c89e145249630c8fe19db479211f8b4e4f1ea6d15332c6663c60f4
font_02_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 12264 bytes
SHA-256: d6f2b8fffc3db7d8e0e9739bd65658ae568faf700d360ab4d0a5f758afd80b06