Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc475adac108e0f6…

MALICIOUS

PDF

157.7 KB Created: 2021-05-30 20:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cd3f46721e55db063af250adb8b0ed8b SHA-1: 09e8425eb2c3d95485e53c888b0f6c8aa5c431f8 SHA-256: dc475adac108e0f6f19f318d46b289948f1b6134ea4fdf39ddb3f2262c127893
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://soxebez.ru/wb?keyword=el%20nombre%20de%20jes%C3%BAs%20es%20poder%20letra%20ipuc PDF link annotation
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/7014048.pdfIn PDF document text
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/koxofigabe.pdfIn PDF document text
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/75e78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406820/normal_5fca5d6eac2f5.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/zidetuzotokuti.pdfIn PDF document text
    • https://rijejoxutozi.weebly.com/uploads/1/3/4/5/134599637/nuzogetoput_jenaz_tefegijazuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6052c03eb6249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_601f2a3cf08f8.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/tepeteverowi_womuxaligavila_fofuruti_ruduvonezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475380/normal_60063af3d0b04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5ff7da41d201c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409123/normal_5ff6615f9db46.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/buxefogajidubera.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/romatijotipefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_5fd0e3d474172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_60662d172ce2b.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/61e395a5-c956-40e2-a558-d4938fa08f70/zazutujuwuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a242ed42-8a05-4144-8df5-bc0cb5b11400/16286439722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71abbf33-1f9c-41a2-8127-e82cce4bbe1c/rekojusolosixepoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17416aec-cd3c-48bb-aaba-4d91e2e54bbb/39972087014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1e9ac6-66cc-4e35-8a74-ce2247418a11/software_design_document_example.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_off00022c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C43 5508 bytes
SHA-256: 347c770b3fac36c71d0f10b3d4fb3479c2e2de7c2e52b8a536fd0ba7ca0d2823
font_01_sfnt_off00023ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EAD 12508 bytes
SHA-256: d370c287b49456fbf6ae79dd178418061d703a078c6baac73d62c0ccbe838d47

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