Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ebf79f5edad995…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 16:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 10498734040637cad47e8fc55e1e9367 SHA-1: 72f74ad2ad71b7f3b867f1f63fae4322b2343c42 SHA-256: 11ebf79f5edad995d93e66fb85af6e6ec0237094001e633d311aba869bb53f76
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or scam attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The primary URL, 'https://seumenha.ru/strik?utm_term=nursing+job+interview+questions+strengths+and+weaknesses', is likely part of this redirection scheme, aiming to exploit user interest in job-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=nursing+job+interview+questions+strengths+and+weaknesses PDF link annotation
    • https://basixafonamolod.weebly.com/uploads/1/3/1/0/131069750/wenakadibenuxiz.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/30da7132ceecfe1.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/54b9690e72b6b7.pdfIn PDF document text
    • https://murenelu.weebly.com/uploads/1/3/1/8/131856612/kukowetibodawe.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/2489303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2685184-9bcc-4d63-b126-5f7cf6655de3.filesusr.com/ugd/267f13_3d4a3cf34ecd42798a148fca67cd1c3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46bbbe4-47b5-4b77-bd82-42aa2f9aa584/riwimuwogodakixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6444d6-e2ce-4ec2-84a3-f7bb7b681397/80127930490.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/amazon_appstore_apk_android_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272932c6-3972-45c4-838b-27ce5ebc73f4/nejedozudujarorar.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_ca293c8dfa37403fbae2ff5f6897469f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/colorado_state_patrol_accident_report_lookup.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_39cc94e17f2b4c629b0db84f44f45a70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e263b1b2-8fd8-4d70-ab1b-cfb504808c68/formato_de_solicitud_de_empleo_editable_en.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_ca796e982b90485782a1be0d04985855.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_447499aaa4be444b9d07575126ef9892.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/32365498770.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_fc83b47d22d744bcace9f0431beebd2a.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_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 5584 bytes
SHA-256: 3ddfc2feb146a56cf56314b3f05f18d57b66207698f84991d81dbc0653c41107
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10584 bytes
SHA-256: fc7a6ecd8da98b8f230e1ff1b0bf65e94e38783bb236c22d9f0cd7727301d145