Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ea7f52c08a0379…

MALICIOUS

PDF

109.0 KB Created: 2021-05-28 22:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c8718efc8cafa84d6441bc3c32f8f3c SHA-1: d2f846ded8b2598eb50374f512f5d012976a9c8f SHA-256: 03ea7f52c08a03795e560b989c0e540f76f79587fe549195b0e09abdc3faa2fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files hosted on external domains, likely serving as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/strik?utm_term=lexus+rc+f+parts+diagram
    • https://static.s123-cdn-static.com/uploads/4461525/normal_6008298787a9f.pdf
    • https://cdn-cms.f-static.net/uploads/4450243/normal_60381835c29b9.pdf
    • https://cdn-cms.f-static.net/uploads/4495413/normal_5fd32719bb7fc.pdf
    • https://cdn-cms.f-static.net/uploads/4393632/normal_602738f18d035.pdf
    • https://static.s123-cdn-static.com/uploads/4408583/normal_60035483668c1.pdf
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5febe29f00bd0.pdf
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5fc9f90b62566.pdf
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/dugegoru-xotazowujinot-diwavidofikuw-numadivajujami.pdf
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc985253e0ab.pdf
    • https://tefifegewa.weebly.com/uploads/1/3/4/3/134335978/3335689.pdf
    • https://cdn-cms.f-static.net/uploads/4413370/normal_604b416057f40.pdf
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5feba16b03527.pdf
    • https://cdn-cms.f-static.net/uploads/4462992/normal_5fe86331958a0.pdf
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/mazowovotur.pdf
    • https://static.s123-cdn-static.com/uploads/4426971/normal_60059da14addb.pdf
    • https://gejidodedawo.weebly.com/uploads/1/3/4/0/134018108/xudifoxuk-ruweru.pdf
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/tokebiju.pdf
    • https://cdn-cms.f-static.net/uploads/4465709/normal_605d81b5450ee.pdf
    • https://cdn-cms.f-static.net/uploads/4447267/normal_602b9b24edb7e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a32e9aa2-2b0a-4cbc-a598-0db5e87fc7bb/american_dad_apocalypse_soon_hack_android.pdf
    • https://uploads.strikinglycdn.com/files/716e6b14-0d3d-4fba-bc1c-bd6634376f71/how_to_set_up_bushnell_golf_watch.pdf
    • https://uploads.strikinglycdn.com/files/91bcd667-c939-48da-8328-e4c8ccb2bc97/85374087688.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011575.bin
b54fbf916183ae04cf8e28d156b8e6fafa56fce4030a9ad13add9b5c741d00c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 20692 bytes
font_01_sfnt_off00015736.bin
b1f258d130f66032325b692ec1a6298aa8a7aa7e94308c33c33131bb89aecbac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15736 5452 bytes
font_02_sfnt_off000169bd.bin
f278254710262a8559be6a2db5b1b5e02a5b94ed8dfe5135d22b3e866e87459b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169BD 11188 bytes
font_03_sfnt_off00018fae.bin
019e92530604f520106ad5c4b76966f1dd6ed19205c931d1b65f84b35f1178c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FAE 16088 bytes

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