Malicious PDF — malware analysis report

Static analysis result for SHA-256 041c3de13265e135…

MALICIOUS

PDF

67.8 KB Created: 2021-01-12 11:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e790863156971c7f8dfe6b92662b9853 SHA-1: 90abb17b524f7fe6d67f05311f31823a419df2d0 SHA-256: 041c3de13265e135c7ccfa9982136fd150a9c903f6a8290a9019ecf9c39c10c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded URLs, one of which, 'https://trafftec.ru/aws?utm_term=sales+commission+contract+template+uk', is associated with a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'sales commission contract template uk', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=sales+commission+contract+template+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5fe9ed04ea4d2.pdfIn PDF document text
    • https://site-1217489.mozfiles.com/files/1217489/tilotene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5fc1575654ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/Ea9jcKI/6352381172.pdfIn PDF document text
    • https://site-1171887.mozfiles.com/files/1171887/nails_of_america_heights_houston.pdfIn PDF document text
    • https://site-1166675.mozfiles.com/files/1166675/tibunawoduje.pdfIn PDF document text
    • https://site-1219243.mozfiles.com/files/1219243/sample_annotated_bibliography_apa_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5fb7f8c72bacf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446790/normal_5feb988a37bcb.pdfIn PDF document text
    • https://cdn.sqhk.co/mapigusene/URzhi1K/79040930266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_5fbae8e90fef0.pdfIn PDF document text
    • https://site-1174578.mozfiles.com/files/1174578/m1_prepaid_data_plan_overseas.pdfIn PDF document text
    • https://site-1174826.mozfiles.com/files/1174826/mudding_simulator_games_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gulapore/bluestacks_3._54.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/carelink_application_form.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 5248 bytes
SHA-256: d0d10d0027881edfb7979d9d84adf79d91da5705dc7be4b95205cb5aa03d3f16
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 9628 bytes
SHA-256: 491fefc0ea84a7c667740a76c93d2f4fbb3d45f9845c2b940e9e7bba91146d79

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