Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d391db5c264d4…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 12:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6f7e265d792902a194cd0b564c6ea718 SHA-1: d82fab7f3eb2d29fa17e8bb3974b9e244a228a5f SHA-256: 4d8d391db5c264d4696ed8735c7fbec134b93e40a030f4f5a1d5805d78444eda
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed here, suggests potential for exploitation or further payload delivery. The document's metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=ind560+technical+manual PDF link annotation
    • https://cdn.sqhk.co/gobisofokox/BhjhdKN/wink_dating_app_mod_apk.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/lowawox_banaxumogu_volojovivu.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/75831714659.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/QPtjfDl/46161734728.pdfIn PDF document text
    • http://vurenosul.22web.org/bit._ir_movies_2019.pdfIn PDF document text
    • https://mumasibomogavap.weebly.com/uploads/1/3/1/0/131070301/5205903.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/arduino_micro_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/hdjbgip/64463625860.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/wuxun.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/how_do_i_know_if_my_cpap_humidifier_is_working.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/fjbMxzs/wokisukarepokosujilizunu.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/jbqhgji/smith_s_marketplace_bountiful_weekly_ad.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/vexozamuno_pilamemafuwiw.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/fojajerakofapepeguwaja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimaroted.rf.gd/campbell_biology_chapter_15.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_8cfe41b79bdc4d2d9776783f291f707f.pdf?index=trueIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_e9355476f507435baf778f31d103360f.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_95a80f9bb40b4447ab629e0f1097a0a2.pdf?index=trueIn PDF document text
    • http://fitariruzazu.epizy.com/92679019297.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_a737ac1b69614cad861d8493292a8816.pdf?index=trueIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_ce5a909150304d60b5d60f3f793e1450.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_669e480b8ee444ac8c78eb9e12457e5f.pdf?index=trueIn 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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5260 bytes
SHA-256: 27b00c2f1f8470c871375efc265d65e0baa9210bc7a3d279bf83722d6feb57e4
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10976 bytes
SHA-256: 321f84b39db6e9ef6e55639163d999895e5aee0ac3284a4e8d7cad03894a25f5

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