Malicious PDF — malware analysis report

Static analysis result for SHA-256 f204c30f71f8a67d…

MALICIOUS

PDF

75.1 KB Created: 2021-05-30 06:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4a55748d1989f991aca402fbadc17580 SHA-1: 562e61799c99f04d2dc0bc7a95dd2e35ab87452a SHA-256: f204c30f71f8a67d1284039b2ae5fd35594ab14bb0581ef9c2dff523a7006672
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links pointing to various PDF files hosted on multiple domains, many of which appear to be disposable. The primary function seems to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content.

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://golowaki.ru/wb?keyword=bow%20tie%20pasta%20with%20pesto%20and%20feta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481684/normal_603043327aacd.pdfIn PDF document text
    • https://tipepopodotojo.weebly.com/uploads/1/3/4/6/134636352/kinijasekodemuno.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/8a610be507b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5fe56da839bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_604132ab59f9e.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/ledupotawomafi.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/xolawosikuw.pdfIn PDF document text
    • https://wovuxitijijigot.weebly.com/uploads/1/3/4/5/134524902/bolovofojidudazomog.pdfIn PDF document text
    • https://puxomesepose.weebly.com/uploads/1/3/5/9/135977076/8f8a09209086a8.pdfIn PDF document text
    • https://rusopanuguxixat.weebly.com/uploads/1/3/4/6/134640346/da59fdaf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6027c643d930f.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/6957444.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/127912e4db1d.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/d7975675-51a2-4fc5-be25-a669de2f0d0e/organic_chemistry_brown_7th_edition_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea55b63-3130-4b2e-b9e9-ad7e66b88c5b/87190710163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27defedb-f1e8-4388-95a6-1e2213945eaa/neduronedolakepib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406a3dc4-539c-4115-873b-0bf53731c314/24389726622.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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 5140 bytes
SHA-256: 70e200dffedc88adfcceabfb7e0f34828862889644fdda09f470ff3f8673e4e4
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 12268 bytes
SHA-256: 9395010cd78ed722d811ee9e29ba5b2a40580aac1a208e5481365b2da5ca567f

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