Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c16e0ef4b76b50…

MALICIOUS

PDF

74.2 KB Created: 2020-12-27 17:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2a4cf9b2316f8b1e7dc92b25c615b816 SHA-1: 90ff5015018b68ec58408db412b603e84bb20ee6 SHA-256: 45c16e0ef4b76b5030e3110aa8b1d3268a06328244bbea6d9d4bb2b4d811e7cd
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a large number of external links, many of which are likely part of a link farm designed to redirect users to malicious content. The document's content, though obfuscated, appears to be a lure related to 3D printed models, aiming to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=3d+printed+bass+guitar+model PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f9296e8032de.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/Upr907G/how_do_we_say_hi_in_chinese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_5fa94ab859639.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/hggqNha/68036419922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fe62e26b44e3.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/jivimomarex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd88d467e2e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fc62c8119290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388620/normal_5fdd5d3fd1708.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/wuguwaz.pdfIn PDF document text
    • https://wekonopu.weebly.com/uploads/1/3/4/8/134848362/6371256.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/xoxaneral/tewegoboxugamuwafeb.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/pasawatunemufumogugow.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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5488 bytes
SHA-256: e31c005d3b878403ca23b3739982a929f0d2fa6071bda9ca9472f726524c98cc
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 10120 bytes
SHA-256: 33de614e9ff9ca6ea243db38d6ef7c3c3b15a9c1b3573be4cbcc6507dad0aeb8

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