Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea46fe72a3180d5…

MALICIOUS

PDF

66.0 KB Created: 2020-11-20 10:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ce95b5ca68e45021e536eb86e10a1c6c SHA-1: b3094efd4e910db6977717e4ac78287e7a40a300 SHA-256: 5ea46fe72a3180d56b866ff150cc56f50e9b21ed5630cc9b554d0cccc82717c9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely as a phishing or scam lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a coordinated effort to distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=copd+breathing+exercise+pdf PDF link annotation
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/musupa_joruworuvuzibex_gixunoj.pdfIn PDF document text
    • https://gowewibejeji.weebly.com/uploads/1/3/4/4/134481286/7bc8074cd1.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/digab.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/vevonofoma_nifokot.pdfIn PDF document text
    • https://rakikamizop.weebly.com/uploads/1/3/1/4/131437254/d93e1a59.pdfIn PDF document text
    • https://kidudowo.weebly.com/uploads/1/3/4/3/134318554/niwopolilazekat.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/7f5f5c88-a587-436a-b857-01cc128e499c/sr20_workshop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/cute_doll_images_for_facebook_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/32047323617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc47d1f-26c7-4104-905e-d89382259b2e/55196708269.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/benevolent_fund_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/fayetteville_ar_channel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e678059-a7f2-4ae4-a410-2e9a81df2d70/table_theme_ideas_for_trivia_night.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c44ae94-e82a-4f9d-90c2-855897f657fb/may_20_2013.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5500 bytes
SHA-256: 76a7e0ea08a7d5deb0fafccb311df69b9fbbf585e828b93f1626217f81fe1fd7
font_01_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 9636 bytes
SHA-256: 98b683434f8b7237e776c782e1af3f7cb2c2d9a2faf52f633d2b4d52b6c80a41

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