Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfca786b2e4936d…

MALICIOUS

PDF

78.0 KB Created: 2021-04-26 17:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 50a379ee32cdd0069d6cac7965059609 SHA-1: 5f7ef5ccb3acdc2f64d8fe9d5603b23dad02f175 SHA-256: ecfca786b2e4936dea4189bbb60b3807f0918f8cd9e7bb371c7f7b0a4f9de1f5
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or redirector. It contains numerous embedded URLs pointing to disposable hosting and known malicious redirector infrastructure, such as 'dafemum.ru'. The primary function appears to be directing users to potentially harmful external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=what+is+ideas+in+the+six+traits+of+writing In PDF document text
    • http://sumodena.getenjoyment.net/77325825321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5fe11eb689af4.pdfIn PDF document text
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/81a8cae63c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ff81a73eb2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fd182a1939f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_60092d75b4668.pdfIn PDF document text
    • http://mulotaras.iblogger.org/jajegogetekebebixobolo.pdfIn PDF document text
    • https://modedebakilab.weebly.com/uploads/1/3/5/3/135392074/josebevitoxivuziz.pdfIn PDF document text
    • http://zarumesa.mypressonline.com/korean_reading_books_for_beginners.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/99521004063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5fcc09b5a5b22.pdfIn PDF document text
    • http://megivisu.22web.org/97762716752.pdfIn PDF document text
    • http://kiluniv.22web.org/above_ground_storage_tanks_myers.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/9021622.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/3251662.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/14775378095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_603d545746234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_602473f6bb908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paborijobo.epizy.com/52957895523.pdfIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_41489aecb17d453fbaa010c584735d45.pdf?index=trueIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/68400048571.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_a98fa39501d74b7d8789097202a29f53.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_60f6825e298546fab3b2dc6cec168f45.pdf?index=trueIn PDF document text
    • http://vofekopo.rf.gd/raaz_2002_movie_480p.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_a6308679329143f787dc80c6f741843a.pdf?index=trueIn 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_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 5308 bytes
SHA-256: 36201e49bc4c8b0412bd80e9f9a1d30b8abdd91dfbd75071413c26a702bfbc66
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 10584 bytes
SHA-256: a74046ff945ddb967df884a8cb18a435b4960a9935b544bbb8228dd00b6c2f09