Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ab7e1eae14ab6…

MALICIOUS

PDF

64.3 KB Created: 2020-12-18 12:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0e911c305dcf7520b0a0eec99be4ad34 SHA-1: 26e6243b67808e7cef3881d1e2367501af09e052 SHA-256: 743ab7e1eae14ab630476e87f15dcad3d4285b44bcfc01b8d5a58959aabca748
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'https://trafficel.ru/aws?utm_term=cisco+attendant+console+client', which is likely part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/aws?utm_term=cisco+attendant+console+client PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fca6894c0f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f8d5dfb9d1e5.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/1316439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_5fb5cfe09159a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f9bb60e7c322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fd5f5cb617f2.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/kebaguf_jugegit.pdfIn PDF document text
    • http://<IP-CUEAC-In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/43049716681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4c9d71-ff8d-4bed-8bb3-b04429357602/moxie_salon__beauty_bar_montvale_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/indesign_folded_booklet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/4959704128.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/luxulaluzoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5a71da-d489-4435-bae6-e75557f17672/73618492424.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/android_phone_manager_app_for_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EF 4648 bytes
SHA-256: b656dd040644c1766fa9350cdd4cdae454fce658816400ad9c53bef13cbc0588
font_01_sfnt_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 10632 bytes
SHA-256: e9d09baf3e5654dc3ec75f2ba1f9e70ebf6cc6dfcf2bfb85e79662bc753096ea
font_02_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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