Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb200b1c1debeb6a…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 04:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23f9577675b58836788a90cb390f8103 SHA-1: e8cd7b111c1084c986b06cdf1f2d09f24e703f18 SHA-256: cb200b1c1debeb6aa99af5ea23c854966f7854a32fa7906153bf69b822b89fe9
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors designed to phish users or deliver malware. The 'business by the book accounting' lure in the document body and URLs suggests a phishing attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the download of a second-stage payload from URLs like 'http://crubr.space/43750703838ylgc0.pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=business%20by%20the%20book%20accounting PDF link annotation
    • http://crubr.space/43750703838ylgc0.pdfIn PDF document text
    • http://womans30planet.com/1940762450yz6mw.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/7308991.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/9538098.pdfIn PDF document text
    • https://fuluposusiziz.weebly.com/uploads/1/3/5/3/135321682/xepozoj-zedarigepa-viperu.pdfIn PDF document text
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/0937d386704a3b.pdfIn PDF document text
    • http://greyfruit.space/3386597889chhpy.pdfIn PDF document text
    • http://mirror-x.org/xadesocg0ee.pdfIn PDF document text
    • http://coolvdomaion.online/215236554597m2l0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/beechcraft_sierra_b24r_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/croatia_travel_guide_islands.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/kopowefemapafuniwatesefo.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/auto_call_recorder_free_for_samsung.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/6733310060.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/93484982556.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/pdf_of_beta_distribution_in_r.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/how_to_write_feedback_form_for_workshop.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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 5288 bytes
SHA-256: 526d9a3f74d5c45b2f58dc899f9d8b81ba7c68e7294be5af9edd25df1103fa98
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 9948 bytes
SHA-256: 666e3b4559f6cfd72609b2457beb7f51e208e73b685efbd917552e573f9161ea

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