Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f2d532f610f17…

MALICIOUS

PDF

80.0 KB Created: 2021-01-25 07:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f24a8d3e9cfcd13d01b76a7f770807f9 SHA-1: 8a1d8fc504b2babec8c8a94382e961c93685d4d2 SHA-256: 9f5f2d532f610f173ed77be52b1c70c5a6b029fdcbe00a72924f23021222dc59
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to phishing sites. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to exploit users through external content. The primary attack pattern appears to be a phishing lure or a link farm designed to drive traffic to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://crophysi.ru/123?utm_term=winning+the+story+wars+pdf PDF link annotation
    • https://cdn.sqhk.co/jarebomu/Z9cX11h/dragonvale_world_egg_list.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/8636353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5ff9d719e38fd.pdfIn PDF document text
    • https://tuwukodazoj.weebly.com/uploads/1/3/1/3/131383678/30e360dc8.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/xigofet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390643/normal_5fc9dd5b525eb.pdfIn 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/verirejon/whatsapp_status_love_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/rolisol.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/el_alfabeto_en_ingles.pdfIn PDF document text
    • http://sogonuvusawi.epizy.com/32932084747.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/12815056023.pdfIn PDF document text
    • http://pudekixepubaz.epizy.com/botulismo_causas.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 5268 bytes
SHA-256: 84688066c6c3b401cbdbaf75c322c63074f0e129653b777ab534fd241499c982
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 11020 bytes
SHA-256: 34c56807ce660dd86f2ca842714841e1aa8889b22bf180cb85027027328cc193
font_03_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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