Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdced58965142c6…

MALICIOUS

PDF

87.4 KB Created: 2021-02-24 19:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4095a64262d0d42aced5fee9c7f5aafa SHA-1: b746ecc4e7f15d671a68c595a32bc6d91707fe1f SHA-256: fbdced58965142c6356313d566028fa839f2fedfa29b2439d4ffd941606fa2b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing. The document body, though heavily obfuscated, contains strings related to 'bad guy plot ideas' and authoring application details, which are likely decoys.

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://leonvi.ru/123?utm_term=bad+guy+plot+ideas PDF link annotation
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/rubenatari.pdfIn PDF document text
    • https://sidatotivokusud.weebly.com/uploads/1/3/5/9/135959985/73db0.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/kisulobiporake.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/hjPgehe/winterhawks_roster_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jil7Xgi/39180228675.pdfIn PDF document text
    • http://dimax-matrasy.ru/sean_paul_mp3_download_cheap_thrillso6nwn.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/paliga.pdfIn PDF document text
    • http://shoop-fl.ru/tewawixojugekofxj5vy.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hhhFXjd/roxajakaxuzijedoxupej.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/tabuwerope.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://panidipelenaju.epizy.com/defense_mechanisms_worksheet_professor_hokerson.pdfIn PDF document text
    • http://rosuwofa.rf.gd/lokebomepumejulojoxorako.pdfIn PDF document text
    • http://kodeketabekem.epizy.com/arduino_esp8266_wifi_library.pdfIn PDF document text
    • http://jefepar.rf.gd/33493163212.pdfIn PDF document text
    • http://dovovefuwaxav.epizy.com/medesanibexiwumijubu.pdfIn PDF document text
    • http://sovuberexizizir.epizy.com/88877238998.pdfIn PDF document text
    • http://koxaxinum.epizy.com/free_twitter_for_android_latest_version.pdfIn PDF document text
    • http://mejizemobimoli.epizy.com/booster_seat_guidelines_backless.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 4956 bytes
SHA-256: a8930f7a27f62e29252e686e4de643a58f6990b8becbddbf2a87075695b8ffe8
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 11076 bytes
SHA-256: 9d64e2529ec8b9d9b04c501dd9689e3b9be79a02cf0da2f7ebc6447454717338
font_02_sfnt_off00012c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2F 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
font_03_sfnt_off000141bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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