Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8181bb8152a22d…

MALICIOUS

PDF

69.7 KB Created: 2020-12-25 10:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 92e70e20ba7d4deb4198b2cf099a3d0f SHA-1: bd1acf8fb8d210aab8ad60eb508a446b76d305e7 SHA-256: aa8181bb8152a22d662e61aca71af91c845157c11402b7bc32cf7d2375b4635a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further suggests a large number of outbound links, many of which point to potentially malicious or link-farmed content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=facebook+search+friends+by+city+2020 In PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/980cd654.pdfIn PDF document text
    • https://cdn.sqhk.co/satovepato/dibjfPT/navy_field_2_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dowufagit/jf9njj2/shoot_em_up_pc_games_list.pdfIn PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/b7942f4a4.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/he8gh26/99215399720.pdfIn PDF document text
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/c2aa88d3e1672.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/hgZhbjf/jesetubepodajede.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/4756145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaa8511-b465-43ad-8c76-a65ecb423e87/ls_cedar_vashon_island.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/jolamokusabi.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_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 5612 bytes
SHA-256: 1e9775a27289a4b30471fe1a660bb35327febf03ed7f8c407914aa3d19b3c550
font_01_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 10028 bytes
SHA-256: 3cea74952f5f1442ec2882fad71cf52d5784e8f41ee50d06e30cca533e0b30a2

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