Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be050b1a63129e3…

MALICIOUS

PDF

67.7 KB Created: 2021-03-24 08:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57ea4fc504d266d3b6880235595a262 SHA-1: 85054af3dc98c809fa90c2ae089ab4d37f9e7aaa SHA-256: 3be050b1a63129e3326ab54a4c46dabab75cd54c8ca00367ee9db5d6e8c77b71
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, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=amma+telanganama+audio+song+free
    • http://wutopezogegusi.getenjoyment.net/samsung_hls5687wx_xaa_lamp_reset.pdf
    • http://wigageturuv.mywebcommunity.org/76107061714.pdf
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/wavajolenelej.pdf
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/4677024.pdf
    • https://siganagimub.weebly.com/uploads/1/3/2/6/132683357/7864000.pdf
    • http://tufofol.medianewsonline.com/thallus_organisation_in_bryophytes.pdf
    • https://tajolakafu.weebly.com/uploads/1/3/1/4/131454466/jixugo-lonuladiveron-nadeka-tevesipolaj.pdf
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/xipivedaf.pdf
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/tubasigixes_musuvitop_wazojane.pdf
    • https://xogosikeduvad.weebly.com/uploads/1/3/4/6/134669078/1684065.pdf
    • http://filivugirigivub.iblogger.org/34657822047.pdf
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/811e698aa6e78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_73c45c918edb4638b73cba1be22e76ca.pdf?index=true
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_4a5cf997af5d43aa975fa51cf25809a6.pdf?index=true
    • https://s3.amazonaws.com/lekizopiloref/88660009024.pdf
    • http://purevaxa.epizy.com/how_to_reset_sansui_tv_remote.pdf
    • http://zodumokosijupe.epizy.com/57881981658.pdf
    • https://s3.amazonaws.com/gozifep/the_sign_of_four_book_amazon_facebook_google.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/80396085100.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/nurasumapimal.pdf
    • https://s3.amazonaws.com/tomamujuf/whiteboard_animation_software_free_with_crack.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_ddd133f6a03e4255b0a4d18f8e4cab1c.pdf?index=true
    • 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_off0000ce8f.bin
3b4dff72f494c630612bf7002b9c82cd69b79bfb1726278f066bd438ac31fdad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 5216 bytes
font_01_sfnt_off0000e032.bin
0d56162b87119777479a310267ee71189f2dd289e189445f74706564b4e13b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10116 bytes

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