Malicious PDF — malware analysis report

Static analysis result for SHA-256 245f90f4c94ff49d…

MALICIOUS

PDF

85.6 KB Created: 2021-04-06 20:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1484726aebfd315b3b8c176a0a2c3229 SHA-1: dd158f04a9fd4f889177d7fc3d03aaf2de8d1ff7 SHA-256: 245f90f4c94ff49d3e1d68515a5d1c023885e538dedd5330e26afe68ba5cbbdd
186 Risk Score

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 0.9998

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://resalured.ru/strik?utm_term=how+to+take+apart+kenmore+600+series+dryer PDF link annotation
    • https://cdn.sqhk.co/xexerekija/ij5gfgi/ted_talks_youtube_relationships.pdfIn PDF document text
    • https://sikafajowed.weebly.com/uploads/1/3/4/7/134757433/b94485b8af8a9.pdfIn PDF document text
    • https://negamevetafe.weebly.com/uploads/1/3/4/4/134439480/2268673.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/pisipa.pdfIn PDF document text
    • https://pawuxadatunu.weebly.com/uploads/1/3/4/2/134266652/33b35cb.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/chcIpua/zedixogefoj.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/9197938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_5fc7d5b2dba6468b8022499185ff95f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/2978557156.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_1ac2067f848c4894882008ec6adff092.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_0ee4fabefc594719bc12d23b4f209879.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_cbafde152feb49b3a8a9af006e1dc9ac.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_057651b984d247b1ad5f8d74d866ad60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/extrusion_plastic_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/79788133717.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_95ec5af4799148c3ad921ec3ed4fcea7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/theoretical_probability_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/sex_offenders_near_me_el_paso_tx.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_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 5588 bytes
SHA-256: 5117af2e4bf5e6f06cb76066ccea39bc41b2d536329e8062ada8e80b3b0d128d
font_01_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 12360 bytes
SHA-256: 233ddf2448b9d7f7bda9137e70f95cddff09c0e3c157d96bee98f65d4a537bb0

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