Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05b089d341a7d8a…

MALICIOUS

PDF

77.2 KB Created: 2021-04-12 20:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b955bd6b2b03a21ab5bd3edb2c26db4 SHA-1: 3c49843ad36b9473d1f5206260ed074e9159af54 SHA-256: e05b089d341a7d8aa2fd70d492ca8d0ebc107fbb295fab0085f72085bed6c103
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

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://resalured.ru/strik?utm_term=how+come+my+ac+is+not+cold+in+my+car
    • http://befotuke.mywebcommunity.org/dd_online_virtual_tabletop.pdf
    • https://cdn.sqhk.co/xarozowuzosa/dmhfvid/76618439393.pdf
    • https://cdn.sqhk.co/famuxina/gjjaQhi/nigogodunalaroju.pdf
    • https://cdn.sqhk.co/norowitidot/hHcHUDK/kogopaluguvefoguv.pdf
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/03ad9.pdf
    • http://creditscoreusa.info/el_coronel_no_tiene_quien_le_escriba5tlts.pdf
    • http://bejisosubonito.sportsontheweb.net/ziduvok.pdf
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/kimididugoluxew.pdf
    • https://cdn.sqhk.co/musezikuzapi/ij2dMeA/time_table_generation_flow_diagram.pdf
    • https://segurawunazuzi.weebly.com/uploads/1/3/1/3/131381703/xadugivolunu_fomeziziwun.pdf
    • http://teleporttur.ru/cambridge_primary_progression_test_pe3tdo.pdf
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/2adfffd155052c.pdf
    • https://cdn.sqhk.co/lebapivi/dA1I9Jm/95627473705.pdf
    • http://liko-sneakers.com/wufibefonagusiduwqbnrc.pdf
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/gulafusudajokep.pdf
    • http://the-job.ru/fuwitoponidivudefujedeme0k946.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fb577c3b-07f0-4bc0-96ce-95cdd12fc19b/lujowifumatonaruzepopi.pdf
    • https://uploads.strikinglycdn.com/files/975cffdf-f282-4949-897a-602673fb4f8b/tofagigasebit.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_off0000ee9e.bin
7afc1849f7b2a44be3ba78b031a35e328af684b060cffb13ac195a781627f51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 5240 bytes
font_01_sfnt_off0001006b.bin
9d60421b298933741e7d9a101f09179f2e57d724f3b3d1df17af89f94705fc67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 11616 bytes

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