Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf1de7c0052c18…

MALICIOUS

PDF

82.7 KB Created: 2021-03-10 03:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c6327f284e64c7604eeb1fd4d70b061b SHA-1: 935575903a6aff46ef10bf77076d6e040263f65c SHA-256: a4cf1de7c0052c18f617fa82ab1dfdb183032836066bcdd142aebe0311d254b9
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 0.9993

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://ponafet.ru/123?utm_term=prochem+liquid+defoamer+data+sheet PDF link annotation
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/4954130.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/honeywell_electronic_air_cleaner_service_manual.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/numenifevuvofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_6047ab1373bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_600b2abcb9812.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/anxiety_questionnaire_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_60383ba693e13.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/8798180.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/maternity_leave_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5fdc41968bb9b.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/wanepozon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5ffc2abc21142.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/fejesonedumikuwifit.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/bexolamabad/bcom_full_form_in_college.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/pateniper.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/40021879513.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/born_a_crime_audiobook_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/nimerobajo.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/report_on_flood_in_kerala_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/libro_de_los_sueos_para_la_tombola.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/activesheet._querytables._add_field_names.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/fimilaradedasegijor.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/23880316040.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_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 5388 bytes
SHA-256: 4449224dd3dd157d658add4c65f2d44403489d64e2a7d412029edaf128e61bd5
font_01_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 12604 bytes
SHA-256: 71876a17e8ae4c89f79f1db9f4b54e83241a6f253c899c7d590736708f4b3cff

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