Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8ef81df2e6dbaa…

MALICIOUS

PDF

189.0 KB Created: 2021-01-09 23:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1604a5292b1220d0644f9ef26d97af3c SHA-1: 79eb1197eb33b7b4f301438e49975471a9cb2ca8 SHA-256: dd8ef81df2e6dbaa2034a9ebea6f6ca1e3b27f39e45a41329347aa57a205c956
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and its classification as a link farm on disposable hosting suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://trafftec.ru/aws?utm_term=beyblade+burst+episodes PDF link annotation
    • https://site-1173336.mozfiles.com/files/1173336/potbelly_sandwich_shop_southwest_freeway_houston_tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486035/normal_5fc5761fd5789.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/4FdOjjn/dual_app_samsung_s9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fb043eb5a566.pdfIn PDF document text
    • https://soregoba.weebly.com/uploads/1/3/0/7/130739918/teveredax_panezanabibize.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/wimitipe-fusexe.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/oge5ohc/african_crawler_worms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fca5e4abb346.pdfIn PDF document text
    • https://site-1175494.mozfiles.com/files/1175494/sijavipemiwiseludes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5fe4992aa9c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5f9fdde8824a4.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/lanaladu/spark_big_data_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/dazad.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/resat.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
stream_003_off000199e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x199E0 83796 bytes
SHA-256: 45320bbf7cc90a5abea3f3861bda16777b7e6055a97f24bf3ee961fb22ab9e74
font_01_sfnt_off0002954c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2954C 5244 bytes
SHA-256: bf04bb6e4115e49052df017f31e999a2abbd058b92bd6fc3c36243987f1d43d7
font_02_sfnt_off0002a72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A72E 12884 bytes
SHA-256: aea7796c0b65878a4736cbfdd53290d7fac6e96f68eb9d97d2d6ee1380961757
font_03_sfnt_off0002d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D139 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

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