Malicious PDF — malware analysis report

Static analysis result for SHA-256 f825a8aa6457e3ac…

MALICIOUS

PDF

109.5 KB Created: 2021-02-20 09:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 828b63c05da5ba6894a9ac04ab586b20 SHA-1: 2e39d37f666bc3612f278c8e591cbd33d9b868cd SHA-256: f825a8aa6457e3ac66ad0406ed1ca4b69a89511ed0e371d98c6d22602505c7fa
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple suspicious URLs indicate an attempt to direct users to potentially malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file.

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/wix?keyword=pathfinder+gaining+class+skills PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fe9970d29824.pdfIn PDF document text
    • http://sberetransfer.online/bus_games_free_full_versionwkfy9.pdfIn PDF document text
    • http://chambreapp.xyz/catalyst_9300_config_guidech3jy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_6017b874912f8.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/2509518.pdfIn PDF document text
    • http://reduslim-europa.site/skoda_kodiaq_prijslijstwj9k0.pdfIn PDF document text
    • http://burolona.22web.org/derivatives_calculus_examples.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/15dadbe99.pdfIn PDF document text
    • https://xafovudomogagak.weebly.com/uploads/1/3/5/3/135324285/nalelutuwuf.pdfIn PDF document text
    • http://chambreapp.xyz/catalyIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudefem/violin_duet_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/rip_curl_gps_watch_instructions.pdfIn PDF document text
    • http://funolowudako.epizy.com/ridilafilaxegogemare.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/ribowexulo/heathens_piano_sheet_music_easy.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/potofaw/lesodipamuvavowow.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/birthday_photo_video.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_off00016668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16668 5348 bytes
SHA-256: 104f400ade312e68640e31ec9e409210bb42fefcfae8b9bd5a5969b6fffb2222
font_01_sfnt_off00017898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17898 15592 bytes
SHA-256: dbb23a1d39845919edfe5055aaa4186853796c9cff26a182801e0a94e2f26986

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