Malicious PDF — malware analysis report

Static analysis result for SHA-256 481a521111a621af…

MALICIOUS

PDF

82.2 KB Created: 2020-12-02 05:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27aedebbd0555483c80c75746afa92bb SHA-1: 9bef2dd280d8e6d44777c85e0863e10212d50ab0 SHA-256: 481a521111a621afd5b8cbb98b8d4d77cb82e74862e7f1090cd56d4e6acb3acb
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one pointing to a suspicious URL. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URL likely serves as a lure to a malicious site, potentially for phishing or to download further payloads.

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://traffnew.ru/strik?utm_term=josh+johnson+aaf+stats
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/3104519.pdf
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5fc604f135837.pdf
    • https://cdn-cms.f-static.net/uploads/4423700/normal_5f9c3d6223082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3b3f1f9c-3f7c-47dd-995d-a2d4d1698d65/bedabuvevumogala.pdf
    • https://static1.squarespace.com/static/5fbffe61bf71053ccb0b2b06/t/5fc1df5e4e98326c0254bebf/1606541151373/90656138657.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf677ceaf37e3b64940859/1606379389787/self_reliance_by_ralph_waldo_emerson.pdf
    • https://s3.amazonaws.com/kopisigapub/40095609287.pdf
    • https://static1.squarespace.com/static/5fc563a62cf09257bd89a1ac/t/5fc6fe038f079636156ec088/1606876676121/34727119382.pdf
    • https://static1.squarespace.com/static/5fc112c117e7202640eb3140/t/5fc33650173fb5383b0bc886/1606628948634/65131586640.pdf
    • https://static1.squarespace.com/static/5fc0e940bd14ff0dd29cb4d3/t/5fc552253f75b16643840937/1606767143970/20520576014.pdf
    • https://s3.amazonaws.com/viregujipowuru/evermore_alyson_noel_free.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010eaa.bin
9ec24f1ea02f685157b509c6413b8a6768502bea9d2985f14ac9176729b0da0e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10EAA 26648 bytes
font_00_sfnt_off0000d96c.bin
0c4e9d310a75e7afeaa53df9da0bc73bf61316a3f010f68847bb3c291f604a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 4792 bytes
font_01_sfnt_off0000e9be.bin
332932b51aa11f4e590020887062815f63d5875b1390012543257106be039ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 10796 bytes

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