Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66481b6f6adaba3…

MALICIOUS

PDF

74.1 KB Created: 2021-03-17 00:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54a40dc8ca2735795438fec178143aea SHA-1: 7cbfa3076c982871b4ba13db03c77cd29b01c59a SHA-256: a66481b6f6adaba35a98ccca7ba119bbfa69e2b22bead1b757378ff33c723fae
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=manual+woodworkers+throws
    • https://cdn.sqhk.co/linidivez/jjfgjgf/college_basketball_shooting_drills.pdf
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/lunatidatibi.pdf
    • https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/tafom.pdf
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/435f087f3236b3d.pdf
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/roren.pdf
    • https://cdn.sqhk.co/fafaviwi/if222t8/free_mobile_website_builder.pdf
    • https://zepiwifolu.weebly.com/uploads/1/3/5/9/135965208/104671.pdf
    • http://wovoradomumakil.medianewsonline.com/rofedozavunuzuginufumiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/somamere/ffxv_dlc_trophy_guide_ignis.pdf
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_157a37df9b534a6b94f772368c8f3631.pdf?index=true
    • https://s3.amazonaws.com/nagudo/fundamentals_of_engineering_economics_second_edition.pdf
    • https://s3.amazonaws.com/nijosinizo/harry_potter_freeform.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_212b277e8bba4dff86b43279ef9f2c42.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_60917517be784d688818b3bb5cac0082.pdf?index=true
    • https://s3.amazonaws.com/selivuvumepaveb/kijopodukefo.pdf
    • https://s3.amazonaws.com/dorobukasawituw/suvupipufev.pdf
    • http://wugerubuvugox.myartsonline.com/the_culture_code_rapaille_summary.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_off0000e76e.bin
082759947b8fb10fedceb05d0e1079bb8c4b7998976f3e7df6ac379e1d88f4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 5076 bytes
font_01_sfnt_off0000f8c4.bin
c3898ba1f9ddaaec4deb3e1c83f823ee69b0c3146c541be9ec6cd7f5d95f4931		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10168 bytes

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