Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d24f3f36d939bb…

MALICIOUS

PDF

74.6 KB Created: 2021-01-24 08:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aa5c4a72c7570f2c8235e8b8d37e0f06 SHA-1: 92d2aea37067f4fb7880526636e1296f98306758 SHA-256: 90d24f3f36d939bb219f0d7a25847dcad17e119a9169fd813057650891211e93
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a link farm on disposable hosting, likely for SEO poisoning or to host multiple malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=heat+and+temperature+worksheet+pdf PDF link annotation
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/mumuguxedukol.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/ahEujcY/tawugufimokot.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/4521317.pdfIn PDF document text
    • http://xevidome.iblogger.org/board_resolution_format_change_authorised_signatory.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/sapezarifotogifezupu.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/sjegiDs/7693884568.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/C5hjFjj/4k_cool_undertale_wallpaper_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_6004ea6728544.pdfIn PDF document text
    • https://site-1168462.mozfiles.com/files/1168462/answerphone_off_meaning.pdfIn PDF document text
    • https://site-1175385.mozfiles.com/files/1175385/moriletewigoralape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426954/normal_600506176319e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd9912ec5e1f.pdfIn PDF document text
    • https://site-1174576.mozfiles.com/files/1174576/refusafiwoxutezomiru.pdfIn PDF document text
    • https://nodepinanobepex.weebly.com/uploads/1/3/1/3/131381288/1e6f9988bdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5fffb54c520fc.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/toduwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408188/normal_600087cd7e0ab.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/Phj2Hjj/99300754787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ferenekukosazu.epizy.com/free_printable_may_2019_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/fewarokiripabavigiw.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/mupatunesekovew.pdfIn PDF document text
    • http://zinezalidoratov.rf.gd/forensic_science_mcqs_with_answers.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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 5368 bytes
SHA-256: e42d24a829904c72f815a65a35f1eb709249fc6d7f435cee219daf71d94455f4
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 11920 bytes
SHA-256: f87a7c8e7c78eba17a83d757b3bfd3077acc683a241bc55b21b5762c9f18a13e

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