Malicious PDF — malware analysis report

Static analysis result for SHA-256 9673abda1645eb32…

MALICIOUS

PDF

69.8 KB Created: 2021-03-18 10:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5a93c65fdbe149463e25a257624444 SHA-1: c7b21db8113d9b694c760608f04c3588b9e09c28 SHA-256: 9673abda1645eb3206a4f06dd9118f8213059fda13b4a5f82a8a446c77dc1262
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=best+wallpaper+for+mobile+free
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/5003984.pdf
    • https://cdn.sqhk.co/baruduwege/ggXgjni/barre_workout_at_home_youtube.pdf
    • https://fetuzulozolu.weebly.com/uploads/1/3/0/7/130775138/08f11.pdf
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/gubefogibaluba.pdf
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/panof.pdf
    • https://jorojiwelipevo.weebly.com/uploads/1/3/5/3/135393556/sinusurutixi-tolekaze-ragixowepumusu.pdf
    • https://cdn-cms.f-static.net/uploads/4454302/normal_602e49be6e46e.pdf
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/3193289.pdf
    • https://cdn-cms.f-static.net/uploads/4469643/normal_60253c208ddf7.pdf
    • https://cdn.sqhk.co/rowunozimop/Engfhg2/34934987429.pdf
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/8e0db61b.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_601876b9576e6.pdf
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5ffb8c0ccc11c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f694cad1-4af9-4153-afb6-e8f828d3ad57/hp_pavilion_dv5000_audio_driver_windows_7_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/4cfe6ca6-13a6-487d-9cd5-2d9a809bdae6/singapore_math_kindergarten_sample.pdf
    • https://uploads.strikinglycdn.com/files/e7d958e1-92f2-4c84-b8eb-02dfb419b727/wasanil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d502.bin
572bafb817778faf5bb400839842ab5703c1dfd77d9f87986a8bb890c6f4b489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 5328 bytes
font_01_sfnt_off0000e71d.bin
1193a57bac2f1d40f06dfcd022ceebd3bbc74cbc4b34f45d3a498a24aa7f4c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 10216 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.