Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01e84348ee0f071…

MALICIOUS

PDF

61.2 KB Created: 2020-11-18 10:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8bac30876d4c18aec04215eaf9de4bfa SHA-1: e2e070face9685b50d9aa2377cf9c8067ff0351a SHA-256: d01e84348ee0f071097a0080a7af403d35ef24c724bf5134ce3ab8155211e555
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous disposable hosting links further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://traffine.ru/123?utm_term=surface+water+quality+modeling+chapra+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5fa6617d46e77.pdfIn PDF document text
    • https://kezopepeza.weebly.com/uploads/1/3/4/3/134332650/wagepi.pdfIn PDF document text
    • https://kemosufasegu.weebly.com/uploads/1/3/4/3/134348140/9ace2af.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/zokas_gokazetakopaxi.pdfIn PDF document text
    • https://zegikawa.weebly.com/uploads/1/3/4/6/134640481/subotoragola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fa1c3f414702.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/2806e42.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/vobuturinivi/excitation_table_of_jk_flip_flop.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/disisisiwojit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61ea5f4-b5b1-42c3-94f6-4891408bae79/wang_da_naap_song_download_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/kuzinuvafedamubavagi.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_off0000a9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C0 5812 bytes
SHA-256: 1b35e6feb89cd62e0edfeec111bff139cfdd120f115a23a477c32bbdbf62274d
font_01_sfnt_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 13704 bytes
SHA-256: ce2599525b070f215add44814569abfb8fafac6422e8b41275519294ac2a77e6

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