Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ef71b344674ae2…

MALICIOUS

PDF

71.8 KB Created: 2020-11-13 13:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ae7198aace2826a3de3e7f025a59a2b3 SHA-1: 87925644adf50e5ec0dd956d1c4e25d3f8f333a7 SHA-256: d7ef71b344674ae23d904e280c33d81f073965f68c0efae343f074712dc7aa13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various domains, many of which are hosted on disposable platforms like Weebly. The primary purpose appears to be directing users to potentially harmful content or engaging in SEO manipulation.

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://traffine.ru/strik?utm_term=ayyappan+swamy+song+ringtone PDF link annotation
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/wimeludexujade-tovugu-laver-sebosezisewas.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5f97b8f49185f.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/4096216.pdfIn PDF document text
    • https://rimususoku.weebly.com/uploads/1/3/4/5/134587725/wavujipe_zasuwuwomu_vozib.pdfIn PDF document text
    • https://rowiranuzexu.weebly.com/uploads/1/3/4/4/134436227/xurupaluwam.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/jususaseximevewezam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f90ba5ddeb0a.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/bikikanafopavu/kenogigojepavaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8930daa3-a03d-47f5-a170-efcd5035e871/78148046050.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/71876410862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befde422-ce98-4513-bcdf-1901a18d2728/wofekofi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/avg_2020_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192bedbf-ee75-4c54-aaf1-e43c4f7bbf26/43011919358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbaa2ae-7ca0-4ca6-b875-0ed10b536cec/liquid_nail_dry_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10368232-a63f-48a3-8905-2e64c214ad82/37545547764.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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 5292 bytes
SHA-256: c82792b47b1eb134050db5ea3152ddf26cfec6dba3928aade7c11932a1dea873
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10844 bytes
SHA-256: 5067f4bdfafeb548818ec61f68a9c7ed8ff512a56c5db0ea22f67018be50656a

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