Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda8799235dcd0a9…

MALICIOUS

PDF

93.2 KB Created: 2021-05-28 18:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f4d7032cb9ef09d1d73381eaed0a16be SHA-1: d8543fffa1b46fa12bc8f491bd16c22bd3ffa31e SHA-256: fda8799235dcd0a9ad285aef975ba07fd485099ad27124edb0959baa540cb85f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://dugedepap.ru/strik?utm_term=what+are+some+criticisms+of+projective+tests PDF link annotation
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/68451436d.pdfIn PDF document text
    • https://nawigabijaku.weebly.com/uploads/1/3/4/5/134599080/782659.pdfIn PDF document text
    • https://laripevomed.weebly.com/uploads/1/3/4/2/134266376/maritizabafijij-kixubapip.pdfIn PDF document text
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/c16784dc866.pdfIn PDF document text
    • https://xebutikud.weebly.com/uploads/1/3/0/8/130813588/f7d8bd41989.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/5912370.pdfIn PDF document text
    • https://limiretila.weebly.com/uploads/1/3/4/4/134465375/jabiparu.pdfIn PDF document text
    • https://gokidobizivoji.weebly.com/uploads/1/3/4/4/134495246/6584e2059e91b78.pdfIn PDF document text
    • https://xikiwideb.weebly.com/uploads/1/3/4/7/134730665/bupolixegot.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/2431080e022fffd.pdfIn PDF document text
    • https://dagukipaxezij.weebly.com/uploads/1/3/4/3/134352206/kifejir.pdfIn PDF document text
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/binukelon.pdfIn PDF document text
    • https://juzubuju.weebly.com/uploads/1/3/4/7/134703155/0a82867d.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/a32a8e.pdfIn PDF document text
    • https://ravaruxotono.weebly.com/uploads/1/3/6/0/136087447/1956.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/43ce11b35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef66a281-e780-4f74-a017-b123251237c6/hp_compaq_8000_elite_sff_pc_drivers_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f12dbf-b0a9-4b9f-8d0a-b7dbe2c3b555/hoover_windtunnel_max_capacity_pet_upright.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_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 5372 bytes
SHA-256: e561fad353b6fe6bdac89cff59dc37c7b523f7f74f61eb1e3727dc31cdc62c30
font_01_sfnt_off00014201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14201 10940 bytes
SHA-256: 0a08da1a2bf5212030119ce15ca7864a6777411fa7728b27dc5fbfb5ad348d1c

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