Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce93782385fd00c…

MALICIOUS

PDF

72.2 KB Created: 2021-04-14 18:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e02f5ad7c2bba2cbd86358b0abe597dc SHA-1: 12766778d6126766d6701a0fd1dee1458cd2ac89 SHA-256: 3ce93782385fd00c3b759d919ae225d3e2653f03cb929f2bf6867a6c24f5fd16
186 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 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=how+to+get+your+driver%2527s+permit+in+georgia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371023/normal_602ee815221a9.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/0771d3842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5ff0e8aaa0bba.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/sajasatasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_600e44db8d7c3.pdfIn PDF document text
    • http://potobol.22web.org/episode_guide_the_good_place_season_1.pdfIn PDF document text
    • http://nupamimebevoz.iblogger.org/7282661098.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/809ca44d7382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_600b115f5a057.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/870969.pdfIn PDF document text
    • https://zanobuxukopul.weebly.com/uploads/1/3/4/6/134678616/7868036.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/62111966160.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/nakepibaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofuxolisemaxim.epizy.com/29506793543.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/what_is_the_military_call_sign_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/cules_son_los_sntomas_de_la_trombosis.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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 5496 bytes
SHA-256: 71e16c49d48624c96c47795b8b1f2f0735143ac16e92327cb7d0ad8621deb95a
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10364 bytes
SHA-256: eac982ea5efc6c85e224a2a44a31f6cde82c4682020ca17f7533b376cf7cbafc

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