Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea3b140dcd2bdc3…

MALICIOUS

PDF

76.8 KB Created: 2021-04-12 02:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f9ae4a24fda11b6cd3e84b2716b3d3d6 SHA-1: a9f13c82df7bfb6da0043c91b2bf07d69ed9d408 SHA-256: aea3b140dcd2bdc30e6a35789d8d032918a3fef750a4b7faa86315604124be28
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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.
  • 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://leonvi.ru/strik?utm_term=what+is+compound+sentence+example PDF link annotation
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/2021132.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/hdKhf2r/51932489094.pdfIn PDF document text
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/luwusedepevaxasepiru.pdfIn PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/mibirovopoz-finoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/6LSzvgh/national_corvette_museum_motorsports_park_bowling_green_ky.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/pexegaxeteka_gazixowitib.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/d664023.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/taviwegefu.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/1zr25ki/guide_for_super_mario_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/oGgjgek/pobeladopafijujuruvemizab.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/ZhgHSX8/strategy_games_free_unblocked.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/273e3e310.pdfIn PDF document text
    • https://tuzuxomewe.weebly.com/uploads/1/3/4/5/134527180/3b21eee99b94f5.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/6I1nicx/28713585956.pdfIn PDF document text
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/rusamagovinova.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/icvZVhb/bukafik.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/b0c4e4.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/5116583.pdfIn PDF document text
    • https://vopuxobud.weebly.com/uploads/1/3/5/9/135974080/33b92.pdfIn PDF document text
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/mowozolika-naragivube-bofulisoviremo.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/Ovgfdhg/sazuzinodipagugapo.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/549286.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/db1f7d2.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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 5296 bytes
SHA-256: f4bfc61416224930adb49e8a9243763fd67667ddcc0c83d6c2a43dae0253d721
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 10128 bytes
SHA-256: f3964cf85eaf272b3e702d5b930bd5e59a1dddefada120147fbe43166a2a4e78