Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fcb450a36a76f8…

MALICIOUS

PDF

76.3 KB Created: 2021-02-12 12:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8d4a2110d4872ea93f54dc5817ae1de9 SHA-1: a75b46384ebde4cc90e03041d9615319aa0743ec SHA-256: 58fcb450a36a76f8a88c6a48a52fc2052831d2fb55d929b309d93e997d2ebd6e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. The primary URL, https://jacksth.ru/wix?keyword=free+running+games+online+unblocked, is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/wix?keyword=free+running+games+online+unblocked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5feb96b9ac0b5.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/gh2jjeF/boy_skins_for_minecraft_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601fb337235a9.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/5Hgj2ja/jibejedapizegaveporutunil.pdfIn PDF document text
    • http://xabotijal.iblogger.org/vegan_alkaline_meal_plan.pdfIn PDF document text
    • http://bagururidafu.22web.org/formel_1_boxenstopp_anzahl.pdfIn PDF document text
    • http://zanibajawin.iblogger.org/37652003069.pdfIn PDF document text
    • http://busotokebos.iblogger.org/74133413827.pdfIn PDF document text
    • http://gisonanezoboru.iblogger.org/65140043603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_60174df5ceccd.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/Yiigez5/battery_charger_for_car_autozone.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/8e0136a.pdfIn PDF document text
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/seririgineligez-pelirefagexokon-sebogetavowasab-zupegojo.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hjlALhg/remafozulosatimu.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/bumolaripo_jibutejutubugeb_lexebekozonek_diwugajoxa.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
    • http://zufelagek.rf.gd/selebigavaloxidanofejazul.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/89825198203.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/xujigebipisagexero.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/talk_talk_asides_besides.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/annabelle_comes_home_trailer.pdfIn PDF document text
    • http://jawuguv.epizy.com/font_awesome_free_offline.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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 5220 bytes
SHA-256: e3b1a3190de70a4b82343a7c4fa625aa3bc6465ba112b3a546e61617688e9963
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 9768 bytes
SHA-256: 6d605bb54a72cff5c44835d9a4805febae2485594c804dd627f14d4d6e39b6ce
font_02_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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