Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1a2b6faa35d000…

MALICIOUS

PDF

69.6 KB Created: 2021-06-01 12:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3a78d7ae935118ea91453d12f5d557b7 SHA-1: f1ea3b8d96116dd6facc3ee6bb630c0aee3aa6d8 SHA-256: 5a1a2b6faa35d000f9e1249368265de4bdfeb18c0ce45b0a01d7a3173d230dbe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common tactic for link farms and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, including those on disposable hosting, suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://nomylo.ru/pbw?utm_term=how+to+catalog+old+coins PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4450148/normal_60b5d9ea207a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_60527d2451468.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/1187032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_60532c6245272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_5fe9ead521f90.pdfIn PDF document text
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/wikof-luguvesin-rezubamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_603305d7a3d8c.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/3969778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_60545b60a94d3.pdfIn PDF document text
    • https://talibixakezadep.weebly.com/uploads/1/3/4/5/134590085/wutogiguwimugovu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413319/52491265280.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/ardiente_paciencia_antonio_skarmeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802c18bb-71c1-4b11-8bb9-b74b6a58b5b2/how_to_sync_vivofit_2_with_android.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/71288602103.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144427743/can_you_download_fortnite_on_a_macbook_air.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144426003/rozijinunigivoraridox.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/gotaxala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897c470b-24fc-4a16-983d-fb6916fe8f66/85823913783.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144417405/sexotawo.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/karalis.pdfIn 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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 5064 bytes
SHA-256: 2103cdad01c0f274225e82e9381cb1f1036aaf0f3c6e8b12a5d25b6296e53e7a
font_01_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 10436 bytes
SHA-256: 4627d73cdeb783b46e61a2d774cca8491222cb93f9a49733138cef489b67dd14

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