Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d44c7d9bba52ab…

MALICIOUS

PDF

127.4 KB Created: 2021-01-17 09:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5bb4c3b14b21ca13c4cc9f8e61382f3d SHA-1: 6100426a9e93d07030c54a3e1244c6baaf5174c7 SHA-256: 94d44c7d9bba52ab4d5dc22d6ac48d3d8fdeea83a0447f4f88d49bb7dac077a8
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection also strongly suggest malicious intent. The sample likely serves as a lure to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://traffmen.ru/123?utm_term=shadowrun+5e+assassin%2527s+primer In PDF document text
    • https://site-1238130.mozfiles.com/files/1238130/7749955096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5ff3a75528129.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/0eb1feb2f.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/dowet-javibulizexivot-nububu-toxov.pdfIn PDF document text
    • https://site-1216840.mozfiles.com/files/1216840/sixuzanovanupa.pdfIn PDF document text
    • https://site-1211231.mozfiles.com/files/1211231/hallelujah_amen_song.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/93940224490.pdfIn PDF document text
    • https://site-1199632.mozfiles.com/files/1199632/33752915743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_6000e9b0de57a.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/fast_furious_tokyo_drift_cars_pictures.pdfIn PDF document text
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/puzaki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_5fbbe79825d92.pdfIn PDF document text
    • https://site-1175777.mozfiles.com/files/1175777/real_racing_3_hack_apk_download_ios.pdfIn PDF document text
    • https://site-1171694.mozfiles.com/files/1171694/27105290946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_5f94d4326c1c0.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/yakima_theatres_office.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B669 5520 bytes
SHA-256: b90173a9c004852c6c9239f31f4e727d04a781ee0e02f995a746d19e69b6db3c
font_01_sfnt_off0001c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C91D 11764 bytes
SHA-256: 43efc65eb6a50c3edcee25b7a4b4cc00b3c13c9acf3cfa0df2dc781f80557623

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