Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb97d3057514bf…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 22:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b85e0609a3fc2bd14154ee00d55faca4 SHA-1: 207dc1e76dde2f9ca95bfc8c8466f6098bc210d0 SHA-256: 4feb97d3057514bfb5307a474d1e45725a4d1c5866f3477691f081e8677537eb
156 Risk Score

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 0.9956

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://fokemale.ru/wix?keyword=tv+app+apk+download PDF link annotation
    • https://cdn.sqhk.co/vimerokil/jim25ji/tipubavin.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/f58hejg/kegitefujurulelepozozu.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/j6UjdQp/43156171165.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/nogotifafiradulu.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/what_is_leap_sleep_regression.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/ZgiqJTE/make_buttercream_icing_thicker.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/solid_and_liquid_propellant_rocket_engines.pdfIn PDF document text
    • http://rudeniwabirever.iblogger.org/79581856720.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hilhgxi/fnaf_foxy_and_mangle_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_c5f9baace86040bf84e07515e43c50bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/foserumuteduwoxezepodum.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/lolajat.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/chicago_referencing_guide_websites.pdfIn PDF document text
    • http://mivajale.rf.gd/bodyweight_workout_for_chest_and_back.pdfIn PDF document text
    • http://wofukisunoxo.epizy.com/homem_aranha_jogo_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/jeverirabowefunaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/18364609618.pdfIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_acb5e534759648f79e1992b5d48c8592.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_03af5989392b40018332399fae09e585.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/41768087597.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/holden_evening_prayer_magnificat.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/saxesuwenokab.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/sceptre_tv_remote_control_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/89454906116.pdfIn PDF document text
    • http://visasefiji.rf.gd/56127301686.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/63095494325.pdfIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_f8738b494a95441b92c50531b9abb0c9.pdf?index=trueIn PDF document text
    • http://zobadobu.epizy.com/airmail_windows_10.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 4844 bytes
SHA-256: 6bc96e78967b03dac70b94f80701829235d2c3ae64fe754008f12f4edf545aa4
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10548 bytes
SHA-256: 4bc446fafba7d958d02e0da887154cf4b997d5d0ec9c15ca75ccf186567f6165

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