Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88bdf6bf4a914bc…

MALICIOUS

PDF

68.5 KB Created: 2021-01-11 12:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d629d83824d100617f0bd57dd128d1a4 SHA-1: 99cc6097da748025164467286d7852e29e803d64 SHA-256: d88bdf6bf4a914bc376c2d58fd910174bf54fd4e92b97b6798350cd3023a1f44
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=aktu+exam+date+sheet+2019-+20 PDF link annotation
    • https://site-1211863.mozfiles.com/files/1211863/92414620370.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/Y64OTia/rigigojunaj.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/dimatujovesotiwute.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/nedagedog-manobit-tasaleguj-sasitagibekepi.pdfIn PDF document text
    • https://gupesasuxubigu.weebly.com/uploads/1/3/4/7/134717911/majoxosovexipa.pdfIn PDF document text
    • https://site-1237389.mozfiles.com/files/1237389/64227576055.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/mewonenubatas_sunifuvumu.pdfIn PDF document text
    • https://site-1177982.mozfiles.com/files/1177982/suseriwewekotivesubovik.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/nuvukivaxiren/helical_antenna_advantages_and_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/redux_form_boilerplate.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/new_oecd_guidelines_transfer_pricing.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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 5572 bytes
SHA-256: ab46db68bb5c0c4c9e917fbd6e10849905d369c3104d7c5a1fd7a078adadf06d
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 10616 bytes
SHA-256: bb51dfcd3b8e2a803fe56592b9f035caa8146ab458e895db1fe06d5f38daa1a0

Open this report in the interactive analyzer, or submit your own file for analysis.