Malicious PDF — malware analysis report

Static analysis result for SHA-256 77293715a975f285…

MALICIOUS

PDF

74.0 KB Created: 2021-03-01 00:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 799da1f0ed32acd96513c8211bfc6fe8 SHA-1: 8a9b09489d3d93e2c36908fcf6e0b2d0e6522f23 SHA-256: 77293715a975f285ddfb733e1c4a988a4ac353a3d7c403d7d990e578e7bbb9a7
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a 'download button' heuristic suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a redirector for a download, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=autocad+3d+modeling+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5fd1264aeca3f.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/sadewaxidavigis.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/who_moved_my_cheese_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff0bde9146c1.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/schwinn_270_recumbent_bike_console_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6038ed72ecec7.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/9440204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_600eb26db1c9f.pdfIn PDF document text
    • http://bijipejip.iblogger.org/39140035489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_60196007594d5.pdfIn PDF document text
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/d19c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5fdd76e5a7dd1.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/luropiw/stihl_ms310_chain_tensioner.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/netafim_techline_spec_sheet.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/manual_stihl_fs_55_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/aap_guidelines_pediatric_hypertension.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/lukerowudulabefob.pdfIn PDF document text
    • http://jujobope.atwebpages.com/1996_honda_shadow_1100_mpg.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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 5316 bytes
SHA-256: 768ac471e9fd12a47fbd1b5bc46a79fc03ef69a2418a59d71cfa999f347b0199
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10672 bytes
SHA-256: 0972994c5baef24352c5af6432b475b68aa511711ec38bf97fb3ce2f4be18687

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