Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4931ec91396b1d…

MALICIOUS

PDF

65.2 KB Created: 2021-01-11 10:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e7feefdef97691c1baa4179ff454ca74 SHA-1: e68a00d1fc61572d32defc41cc2b62d5567fa583 SHA-256: 9d4931ec91396b1da60cd2000bfcaf8baf3acf037b38de97e825873d84428f35
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The embedded URLs and the document's structure suggest it functions as a link farm, directing users to potentially harmful external sites. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate malicious redirects or exploit vulnerabilities.

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
  • 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/aws?utm_term=dj+song+2019+bhojpuri+gana++mp4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f52f7badf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_5fad340c92149.pdfIn PDF document text
    • https://site-1174809.mozfiles.com/files/1174809/sotuxoxarelinipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f883799eca7a.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/nejetexatakemoxowuzob.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/bluetooth_disappeared_device_manager_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5fcea321bc944.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/42776363695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_5f9dd98c10b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5f94bedd0faf7.pdfIn PDF document text
    • https://site-1207431.mozfiles.com/files/1207431/download_real_drift_car_driving_master_mod.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/xonaxevetaf/siburegepotamujaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/gijokiwuxedovuvona.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/internet_safety_games_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/hotstar_premium_policy.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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 5988 bytes
SHA-256: 9e7d4781b4a2d9887f7bd6fa79fdfeedfa33528ea6f98251adf9de69cb8a1e32
font_01_sfnt_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 9908 bytes
SHA-256: 7d60a86e2dacbfdf0d5c0506b77a23a1327bbebecf297efde43d32a8308fb5a2

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