Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20138522bccd35d…

MALICIOUS

PDF

75.9 KB Created: 2021-05-26 06:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 15523cde15a3ff618da7be161dcd8eb9 SHA-1: 713fc783b2f1ade81385974685d27352ed39f859 SHA-256: a20138522bccd35dc9754c77fd90cf3c1966f82f1fe5339ba728ec5a3e8521a3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/strik?utm_term=expandable+recyclerview+in+android+github PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410018/normal_606340cb1ab8b.pdfIn PDF document text
    • https://tajamexuzoxobug.weebly.com/uploads/1/3/1/4/131410736/mumovulisusa.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/rugimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411228/normal_5fed6b5d4c48f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff22fc512ab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5ff59f761b5b5.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/laxijuriv_rixakorefowafe_zapilaji_xexiwod.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/96c9c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6056ddeb329cb.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/b55148b8d38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386092/normal_5ff0a8108b58b.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/vesogume_verexaw_xutenojujal_pagaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_60179e76edbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_606bce29db7b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_601b02e2a71a5.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/jipexuba.pdfIn PDF document text
    • https://viforiler.weebly.com/uploads/1/3/0/8/130874197/zoguzisodaruj_wuluxabexevez_duvazigowafo.pdfIn PDF document text
    • https://sunuxima.weebly.com/uploads/1/3/5/3/135324667/wodoxawipodok.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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 5576 bytes
SHA-256: 30b19e1f6645e81be0c7495a57609023c68e9538f2dc155f781de1401458056a
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10760 bytes
SHA-256: a507a767fa48eda440565691f75fccf424fa051addad6b4b13e09dc913c67ee4

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