Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9d76693eae1ea8…

MALICIOUS

PDF

77.1 KB Created: 2020-12-24 22:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d7099f04d8893f3e3a7ba60f1b5bef3 SHA-1: d40edca808b3089038383564583ae3b6f8a663e5 SHA-256: ab9d76693eae1ea80b70a8c16ded9725040fa60ee26ecf1298a2a96f7396d284
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafftec.ru/aws?utm_term=android+studio+sqlite+create+table+auto_increment', which is likely used to redirect users to other malicious or SEO-abused sites. No scripts were extracted, but the structure suggests a phishing or link-farming attack.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=android+studio+sqlite+create+table+auto_increment
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/133efaeffc725a.pdf
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/dububopux.pdf
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/e79bc32.pdf
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/7429699.pdf
    • https://tepunejor.weebly.com/uploads/1/3/4/6/134636279/fe7303a0c0d.pdf
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/bonenubudabonadog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c377bfc-d0b3-45e3-913e-a014aaead5da/5685128236.pdf
    • https://s3.amazonaws.com/regegozumekoza/kugukopodalodi.pdf
    • https://s3.amazonaws.com/sefiwegegagu/94525822110.pdf
    • https://uploads.strikinglycdn.com/files/d3d9b4c3-44de-4191-b75b-a6394b35f4d4/41678242484.pdf
    • https://s3.amazonaws.com/suxugipipolazog/78749272852.pdf
    • https://s3.amazonaws.com/luropi/internet_explorer_8.pdf
    • https://s3.amazonaws.com/donake/kale_caesar_salad_nutrition_information.pdf
    • https://s3.amazonaws.com/wiremeresegikon/maths_quadratic_equations.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da60.bin
893eb41ded3c08cda2782a19a68513361d3d419c3e39808623a28291b74206c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 5372 bytes
font_01_sfnt_off0000ec94.bin
01d6e620ca4d2737dadcedbff0ffaffb2c1d06fc05b7db7d47155a489877307f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 11316 bytes
font_02_sfnt_off00011274.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16036 bytes

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