Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aca8c3afa6ed493…

MALICIOUS

PDF

73.6 KB Created: 2021-03-27 22:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f41426c7acf3dbfb075516754e0eee8 SHA-1: 767137266449b1177e2d1e582c25e92f42f46094 SHA-256: 1aca8c3afa6ed4932d9b03207300dcf83a707fc74f4bd49ad161eac12de04974
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple engines, including ClamAV and an ML classifier. It contains a large number of external links, indicative of a link farm or a phishing attempt. The primary malicious URL identified is vilenefex.ru, which is likely used to host or redirect to further malicious content. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/aws?utm_term=whirlpool+duet+sport+ht+error+code+f01
    • http://jekeluxuto.mywebcommunity.org/17363520423.pdf
    • http://kopogaxepaku.sportsontheweb.net/how_to_reset_a_whirlpool_water_softener.pdf
    • https://cdn.sqhk.co/xunijejozi/ghhaha9/51780272976.pdf
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/juleperusi.pdf
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/3816869.pdf
    • https://cdn.sqhk.co/fofateze/KVEgh5u/desisomewuruliken.pdf
    • https://cdn.sqhk.co/xumupojamax/hjehjCp/cn_tower_coloring_page.pdf
    • http://zobabikox.medianewsonline.com/99604133032.pdf
    • https://cdn.sqhk.co/xewafazuk/mfhiW3F/43861181506.pdf
    • https://cdn.sqhk.co/sosexazefip/aEiehca/penelopijezojotusag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ccb18e9-5e24-4ac6-a7be-d21fa6444948/37395589623.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_a463518b43b240b6983837963042aafb.pdf?index=true
    • http://jemukiguwuw.myartsonline.com/tusudofaxivolaz.pdf
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_c3ae0822b165474b9c9c6fc729d2c29d.pdf?index=true
    • http://dapufojutujat.atwebpages.com/32747412034.pdf
    • https://uploads.strikinglycdn.com/files/19d089db-7812-4cb7-8b72-8b312bbd13ad/zofoxokugam.pdf
    • https://uploads.strikinglycdn.com/files/604fdda2-c9fb-41eb-a9b8-7a39de70b44a/kexibivuket.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_off0000e1c5.bin
1657cd103e9a1f12a621d9b395f0f80d49acd9444d42b0ba94fda19956e3a339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 5240 bytes
font_01_sfnt_off0000f3ac.bin
3d8abecfbb0c6477c5f457e182a21770ae65a78ae8e2218b89579679b7db65aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 11132 bytes

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