Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acbef96a9ee9549…

MALICIOUS

PDF

80.9 KB Created: 2021-03-03 05:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f7d2a04b12917cc318baa4b1f28d29a8 SHA-1: da3ebeee066d2a2d22a7c9f09360664aaea7c2fe SHA-256: 4acbef96a9ee95498acace46be702309b0a06eced552dfa922960af68d339bfc
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'xezojetit.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the PDF structure and external links are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=what%2527s+another+word+for+non-aggressive PDF link annotation
    • http://nabavawuzafurur.mygamesonline.org/30029779388.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/w8j7geA/dual_enrollment_classes_broward_college.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/jjiHBR9/true_democracy_steel_pulse_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/3zMiahj/free_new_escape_games_101.pdfIn PDF document text
    • https://vajunepiw.weebly.com/uploads/1/3/2/6/132681590/biranijuga.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/ih1hghg/biwifixaribesojepupimiwog.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/iOZFAjc/lg_health_physicians_family_medicine_lititz.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/what_to_put_for_hobbies_and_interests_on_a_cv.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/gjrghgj/91395206278.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
    • https://s3.amazonaws.com/juzinaramip/raximikadituzusodamofixu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/93610944572.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/lagu_westlife_beautiful_in_white_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/58145212570.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/rukoredugupogavafake.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/77733630465.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/rv_fridge_replacement_chart.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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 5156 bytes
SHA-256: 2733ab2316411876e3b3318b997b9ab827a815732978bc87128c6073e28189cf
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10876 bytes
SHA-256: 745fd81de9c2af1a3a905f8be6a297bc54f533cd1fdd9912ff58fa9d13d56a16
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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