Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73af03f63c37634…

MALICIOUS

PDF

68.1 KB Created: 2020-11-23 13:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fa95c813efc776f28164c57ec7d1019 SHA-1: 2d0983598cd043669282fdc94291f41620c24575 SHA-256: d73af03f63c376343fc6da442a12f9381573af1b17024906cf3460e65ab1df18
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 phishing or SEO spam campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/aws?utm_term=jai+shri+krishna+flute+ringtone
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fa22da676a56.pdf
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fb4c5e574e64.pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fb3d0d4a2895.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdf
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/lanux-rizokadego.pdf
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5f95682483c40.pdf
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fa90265580cf.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/90689.pdf
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5f98733111a53.pdf
    • https://musicdownloads.net.in/wp-content/uploads/2019/08/Krishna-Flute-Ringtone-Janmashtami-Special
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/fajonubinomeder/96302222885.pdf
    • https://s3.amazonaws.com/rujimidujek/scion_auto_wiki.pdf
    • https://s3.amazonaws.com/pujinit/65431215828.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab5c.bin
c6b26480ed11f47c349082a16380b1af494ce831f1adcfa30e478b80543389f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5C 4964 bytes
font_01_sfnt_off0000bc2e.bin
dab7590133190d927684c935f00ee834a33a8a3d5897ef0c43bc3feaa2b7c789		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 9496 bytes
font_02_sfnt_off0000dcb4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 4324 bytes
font_03_sfnt_off0000eab4.bin
338c21120da367d94713add38bc332eff2d8973e2a24f833b260194012f91bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 7172 bytes

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