Malicious PDF — malware analysis report

Static analysis result for SHA-256 c035350f853edea9…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 08:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b2b5765b4023d9766d55a7949c9da22 SHA-1: ea6b29ac3d3a5cb2de882db428cac4fc50e29b7c SHA-256: c035350f853edea96cef06279ccb97c3045a43b4049092f3f487fee075349600
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or spam lure. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure, and another points to a large external PDF link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=john+deere+l100+brake+parts In PDF document text
    • http://romeita.space/androidx_vs_support_libraryq2p7n.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/kizobivu.pdfIn PDF document text
    • https://sanituwinera.weebly.com/uploads/1/3/1/3/131379206/aacbb428df485.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/gjUiiEv/54024403926.pdfIn PDF document text
    • https://xefesikixote.weebly.com/uploads/1/3/1/4/131437823/1428167.pdfIn PDF document text
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/neser_wogojibonarepak_zerevakutizabu.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/Q7Urcie/gel_nails_designs_for_fall.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/1faa5adec6.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jgIPbVd/tipumegivegofatirusoda.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/0b52498fed40.pdfIn PDF document text
    • http://madamzero.com/3ds_max_models_free_curtains24zer.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/sakaburepagase/accelerator_plus_crack_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/52438604049.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/install_ndk_android_studio_ubuntu.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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 5432 bytes
SHA-256: 74e81815d0afca80fa8175d8bedded1ff583023ec120bfb09d02c5689a0019e4
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 12732 bytes
SHA-256: d6d691a97b6d59105e454cf7181a977c133f14df81977f4317344f9d085a8649

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