Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7abaadfffb891a6…

MALICIOUS

PDF

71.8 KB Created: 2020-12-27 04:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9804f255da6037b4382de24de3f3dc6 SHA-1: 9210e34de8f4a07f39db31a16a5e5f53f21a64b4 SHA-256: e7abaadfffb891a661986aa4d69f41e4dca133885a93ac205c4d5802287c83eb
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO spamming operation. One critical heuristic specifically flags a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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
  • 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=dermaset+3d+rollerball+eye+serum+australia In PDF document text
    • https://vijisazegogufob.weebly.com/uploads/1/3/1/3/131380966/cc3a4f56ae61c38.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/4819089.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/03c9c481a.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/Ygf3RTc/polovivinodogumabuma.pdfIn PDF document text
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/d8c0a005897ec2.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/6425047.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/MOO5jjx/63148012928.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/41524371-0c2a-4b1c-8b28-757ceb0d2dd8/nsslha_to_asha_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2acab0-238c-4995-bd78-0bcaad660b77/miduradivonipis.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/calendario_2017_da_stampare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945edba9-8d25-4511-bf78-c818b9b6c2c8/29418539392.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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 5376 bytes
SHA-256: 5a8a3ddd08bbf1434e9c93c8959ffb5613669f96f33f6a7ce8a957d5957e44a8
font_01_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 10324 bytes
SHA-256: 9bd8fbc73d135ff1dfc288370e5e8c7f82c36114954d02c6509448129909fe9d

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