Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb279bcb74f0dca…

MALICIOUS

PDF

101.2 KB Created: 2021-02-26 23:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5185bc62ced70012d9040e229ce1b3ab SHA-1: 291d23e1481b6bf551397b5c7bd6aa920b27b239 SHA-256: cfb279bcb74f0dca03be11f14022605082cbda27a9cec64eafc6873d74ae4d59
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://nipisod.ru/wix?keyword=fnaf+sister+location+unblocked+weebly, suggests a lure related to online games. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=fnaf+sister+location+unblocked+weebly PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410186/normal_603682e5d4ef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fe1f97dafd87.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/9883572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5fe978e696af4.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/sunadod.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/c1afd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60202721a7725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff362b219a4b.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/kubafezin/waterloo_university_application_form.pdfIn PDF document text
    • http://rezazaje.epizy.com/42982536445.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/78343211151.pdfIn PDF document text
    • http://fejixusal.epizy.com/faresadazotazadetufu.pdfIn PDF document text
    • http://duposul.epizy.com/dorney_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/celine_dion_i_love_you_more.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/sad_shayari_image_english.pdfIn PDF document text
    • http://pukafenofi.epizy.com/13320295098.pdfIn PDF document text
    • http://rupevisa.epizy.com/krishna_bhajan_hd_video_free.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_off00014625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14625 5252 bytes
SHA-256: b34696cc80a3241a500b2366d088769973450141aaf0d6b7a476aa0e557faefa
font_01_sfnt_off00015822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15822 9740 bytes
SHA-256: 4b04e304569a89e5436a33008311ca83b71623e1edfff7a989bc7fbae8dc3e5c
font_02_sfnt_off0001796c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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