Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9911e3e644d8090…

MALICIOUS

PDF

77.6 KB Created: 2021-03-13 21:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31d70eb47e3e2b991c8adf3e236c9230 SHA-1: 19ff6e4788492d0387f8d64e7549696483fc0e0a SHA-256: b9911e3e644d8090a41caa156d85f9db1d038310c39c6786fc3784fed876720a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing campaign. The primary malicious URL identified is https://xezojetit.ru/wix?keyword=vinayaka+mission+university+chennai.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=vinayaka+mission+university+chennai
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5ff20ff11be91.pdf
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5fc9d897ae75f.pdf
    • https://cdn-cms.f-static.net/uploads/4379355/normal_604b797c3eb36.pdf
    • http://nuxagoliwanep.22web.org/dijireparemuzudukolugever.pdf
    • https://cdn-cms.f-static.net/uploads/4448740/normal_6017767f4bffc.pdf
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fd7361228b1a.pdf
    • https://static.s123-cdn-static.com/uploads/4387807/normal_5fede7c9bf396.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_bfc2949cb30b485eb9e35ed3510eb074.pdf?index=true
    • https://s3.amazonaws.com/tokit/35612267995.pdf
    • https://s3.amazonaws.com/feseni/wegagamik.pdf
    • https://s3.amazonaws.com/gaxuremewuger/dozejanepoxodebinab.pdf
    • http://gafelen.epizy.com/31720058909.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_6c12387053334f5d838575d9f978d579.pdf?index=true
    • https://s3.amazonaws.com/nefagolom/bubble_sheet_for_mcqs_bise_lahore.pdf
    • https://s3.amazonaws.com/jevedijadiki/xafageregowitose.pdf
    • http://sarilakisorowev.rf.gd/jofogepisilapexaxes.pdf
    • https://s3.amazonaws.com/mikibetiv/good_morning_gif_flowers_images.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_81015d82b1a14aa5a70d3c655a650427.pdf?index=true
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_5ef79565ce3544028e8f1232505b1767.pdf?index=true
    • https://s3.amazonaws.com/rewepalazamiso/65237777873.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c0.bin
191114a60e8ec884ed167cb0c64681dfb72e0ae461f1edb2795ad85279bb4625		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5196 bytes
font_01_sfnt_off00010354.bin
c4a4ed3a790f0016d4d36f4e3cc8dbbae4552cf74ea1093483d3767f079ecc2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 11156 bytes

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