Malicious PDF — malware analysis report

Static analysis result for SHA-256 9611c8408c880248…

MALICIOUS

PDF

77.8 KB Created: 2020-11-29 16:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0701a981766afc33b2c62854781a2b5c SHA-1: d9bd11befa3132639b52912913387fa2919a58ff SHA-256: 9611c8408c880248e962de342a4e706c3e507ce86c541281db7ebb2629cee6e2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/strik?utm_term=final+fantasy+explorers+ninja+guide PDF link annotation
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/1563737.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/9243153.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/6261915.pdfIn PDF document text
    • https://sunawakajisume.weebly.com/uploads/1/3/4/3/134324988/rumixopul_wisorul_jelogaguwudeke_wifexad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fae9cc928657.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/rogekadijapenu.pdfIn PDF document text
    • https://jikiwifapa.weebly.com/uploads/1/3/4/3/134338998/409444.pdfIn PDF document text
    • https://lerivifaladadov.weebly.com/uploads/1/3/4/3/134334847/dafcf.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/gezuteja.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/9ae69039-15ad-4961-aff5-db77cff57d0e/prophesy_of_pendor_best_troops.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/sajawodo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 2920 bytes
SHA-256: b0299174c4a503e320b47feb2076ca39d607fd604b7dbe3133fcbe6d226edb15
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 5408 bytes
SHA-256: 5dc873672e2eb202da47e5508f51add7433890b7fea67ec48ddd19c34aa15c7b
font_02_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 10804 bytes
SHA-256: 0386afbf876dfef6baebb15099918f104d7351198376b702927b576f97abe294
font_03_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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