Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4d5f7ffae38c28…

MALICIOUS

PDF

72.3 KB Created: 2021-02-13 10:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54b880b6be0f00f18150b0fa610a0e4a SHA-1: d3f893b7b4d94c65d99065670519af46616e5bd9 SHA-256: 0a4d5f7ffae38c2802451cca755913fc41afaa97a8f62fbb364739bb3b128c13
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or malware distribution.

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 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://jottigo.ru/aws?utm_term=metformin+1000+mg+er PDF link annotation
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/debunozuze.pdfIn PDF document text
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/fuwebut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463528/normal_600669c42117a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_5fe22b14b13cb.pdfIn PDF document text
    • http://bedebatosisazov.22web.org/bipixilefileserofur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443624/normal_5fd8e73aba627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fee3fe60cee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5fdbe1c359d12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5ff8adc0794f9.pdfIn PDF document text
    • https://resigigemi.weebly.com/uploads/1/3/5/3/135326159/muvomububuwajugoribo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_6022b18982601.pdfIn PDF document text
    • https://lukadivosegiga.weebly.com/uploads/1/3/4/6/134679105/nuwipem_zejisejutixuta.pdfIn PDF document text
    • https://wuliwedifa.weebly.com/uploads/1/3/4/7/134753749/zitaza-gakoferikura-nudap-xudafuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_600558eebf38e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_600096113f8f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff105a60b46e.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/risokuwomijape.pdfIn PDF document text
    • https://fugurisugo.weebly.com/uploads/1/3/6/0/136086283/859c3426b480f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 4868 bytes
SHA-256: 783eedc6a3c6e4064674ae4fed1ea95e5c8a2f50e4f49c87bf8343f0b32b9eb2
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10876 bytes
SHA-256: f7c63eaed4ed03634a354deb43bc0cca1618a794984424a90ffc54749e27965a

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