Malicious PDF — malware analysis report

Static analysis result for SHA-256 776087e643721fd9…

MALICIOUS

PDF

80.1 KB Created: 2021-03-01 03:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5cbe9c4913ea2bcd8335b0057c94bcb5 SHA-1: 731309fcc9261fdc6f362e45353955f3120d960e SHA-256: 776087e643721fd974b0be915051847be915d48bcc3b6dbc2adfd8ed4387dd99
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. While no scripts were explicitly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics, along with the overall malicious verdict, strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=is+sulfur+ionic+or+molecular PDF link annotation
    • https://noberewesuxo.weebly.com/uploads/1/3/1/3/131379636/magexare.pdfIn PDF document text
    • http://idealsit.fun/tejaxibyvxcj.pdfIn PDF document text
    • http://gravkamen.ru/logistic_assistant_interview_questions_and_answersaknec.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hgc1Cja/2902654049.pdfIn PDF document text
    • http://crysety.xyz/760030182876gq0i.pdfIn PDF document text
    • http://unonatur.space/18369629361uzwgh.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/61adbb1f041a.pdfIn PDF document text
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/kezuvowupopepedibi.pdfIn PDF document text
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/582b1f4143620f.pdfIn PDF document text
    • http://rukozhop-guide.com/fefilir9rpf3.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/2405518368.pdfIn PDF document text
    • http://starconflict-game.ru/can_you_buy_jitterbug_at_verizonq40hn.pdfIn PDF document text
    • http://bupro.asia/455105758186jzkb.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/bXhcgcj/phage_meaning_in_english.pdfIn PDF document text
    • http://mx50off.pro/free_whatsapp_video_calling_app491n7.pdfIn PDF document text
    • https://nogojajefe.weebly.com/uploads/1/3/5/3/135314992/f522d32.pdfIn PDF document text
    • http://wutugavefezaza.22web.org/64742205886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roxewew.epizy.com/bose_qc20_android_on_iphone.pdfIn PDF document text
    • http://pazatirademe.rf.gd/manual_reloj_casio_aw_80.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_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 4964 bytes
SHA-256: 65e8f2cbfb8443705c34178dc5da4b8da5698adbdde44365df09bda5df947ceb
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10560 bytes
SHA-256: 1d7da41880a1d779f1693dedc713fbc5078127feb82df8886af16e2b87d3ec0e

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