Malicious PDF — malware analysis report

Static analysis result for SHA-256 e432a486d8d601e1…

MALICIOUS

PDF

83.9 KB Created: 2020-12-25 21:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f401ef777d84c4eacc1230d61fe6c7be SHA-1: 1b665288ffc4808d7a9b5db3a07e5928dabcac84 SHA-256: e432a486d8d601e19fd810c254c661f15cfb9d826b300c1d29428ac818e09053
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/strik?utm_term=std+10+maths+paper+2020+gujarati+medium
    • https://cdn-cms.f-static.net/uploads/4403561/normal_5f925b9e16fa4.pdf
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fa2296998faa.pdf
    • https://lisopivoxo.weebly.com/uploads/1/3/4/9/134901835/sapix-zimogineg-juweren.pdf
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/seset_sapaxa_nulivadejubet.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/7a4f87f3163d.pdf
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/matodetuvesujalomej.pdf
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc725da5bdbb.pdf
    • https://cdn-cms.f-static.net/uploads/4477629/normal_5faf86bb870a5.pdf
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5fddcf7194a37.pdf
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/noxiwago_makalodux.pdf
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/6192605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.indictrans.org
    • https://s3.amazonaws.com/ginutu/31286029790.pdf
    • https://uploads.strikinglycdn.com/files/01ca7a6b-4276-4afb-8a9e-6e98dd8b0e36/jepupasiwojoxinudeto.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_off0000d3f1.bin
c54f9cacf4ffd35bccc98e6436cfbd5f2f7295e26115a6b6d9c878390b099bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 5848 bytes
font_01_sfnt_off0000e7ac.bin
27ff00304a56547f8ab2df49edcb7139347e607483b7ab4e8e8565455ad7751d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 9668 bytes
font_02_sfnt_off00010759.bin
3e636cb9c5fbfcb8a0b5dacd433e7abdea43fc704d3253c3bb91f7196b67db74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 11100 bytes
font_03_sfnt_off00012cd0.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD0 16096 bytes

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