Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7ab833fd4e889a…

MALICIOUS

PDF

82.4 KB Created: 2020-12-29 23:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f2a5555676443d22aad59ad4a2549190 SHA-1: 094793bc56cfc697d1f3b56edf1b7dfc24463ba5 SHA-256: da7ab833fd4e889a9d056c031a65b053ca01bcf8551a11d4ac6ee7a5085ebfa5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest it's designed to redirect users to potentially harmful sites, likely for further exploitation or credential harvesting.

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://trafffi.ru/strik?utm_term=taking+notes+on+apple+ipad PDF link annotation
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/3dce7b9ae94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5fcc4472c93f7.pdfIn PDF document text
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/zamag.pdfIn PDF document text
    • https://cdn.sqhk.co/wukibezoso/NFeheYe/linuvano.pdfIn PDF document text
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/bavuf.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://uploads.strikinglycdn.com/files/55fa9866-e73d-4805-8f76-d3f4d5342b85/definicion_de_burocracia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743142d6-caca-4532-8ec6-1cd0a696ef36/best_classic_doctor_who_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932f67e3-0f20-4590-b2de-f009cb5f3081/ac_odyssey_life_for_a_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2063d9-7265-4ae4-8e8e-1c944a1148ea/69446449666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a86c3c-4d17-4156-be0b-af2eae9d0d02/6145381970.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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 4832 bytes
SHA-256: cf01e9c5f73d318a6b0425acaed3c6144ce84f0dc9791298ed64bade388e9c5c
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 11360 bytes
SHA-256: 18a5059317f8d47e890e68c93cbc10f2b20f1dd425171e343752b11a8e6fa3bc
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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