Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0320af5e6a64b6d…

MALICIOUS

PDF

71.5 KB Created: 2021-03-24 03:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bc608a2aaf99fb91a9bdd281e6658b8 SHA-1: 934f9379417db8457d01f4e92984e697f92af94b SHA-256: a0320af5e6a64b6db26573eab8d5933d15576352878fc9a2df3d44c7c036cd0d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. The document contains a large number of external links, with one prominent URL pointing to 'seumenha.ru', suggesting a potential SEO manipulation or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=sanuk+guide+plus
    • https://teniroge.weebly.com/uploads/1/3/4/6/134693228/pubawasokev-sajom-josiwani.pdf
    • https://xigizimevavas.weebly.com/uploads/1/3/5/9/135982966/5180175.pdf
    • https://zunoratev.weebly.com/uploads/1/3/5/3/135345657/e64b53457.pdf
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/gibegemunabej.pdf
    • http://fonivoguko.medianewsonline.com/fivufemigagova.pdf
    • https://tigoxugijiwubaz.weebly.com/uploads/1/3/4/3/134315710/fodazapiraboj-xetigufapabemas-tiwoxijefame-sunipij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_aa9fcec62574441ba517371f3251162f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a8e96e1-0c12-4ccf-993c-cd7c89be1bb6/ice_breaker_ideas_for_youth_groups.pdf
    • https://s3.amazonaws.com/fatikonavori/avatar_the_promise_omnibus_uk.pdf
    • https://uploads.strikinglycdn.com/files/cb3d0cbf-3fff-411d-b80b-e136db2c7e01/52721710297.pdf
    • http://pimoxonevuwewax.atwebpages.com/xafawunovefuzowovimome.pdf
    • https://uploads.strikinglycdn.com/files/8caf8930-1b28-4e69-8acc-4c1522998d16/kurt_vonnegut_quotes_be_soft.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_f042eaeaacf947aca5f39de667d09067.pdf?index=true
    • https://s3.amazonaws.com/takateg/health_careers_today_workbook_answers.pdf
    • https://uploads.strikinglycdn.com/files/e7c02ce3-dfc8-4d2b-815c-ad0e44aab19e/what_is_agile_scrum_methodology.pdf
    • https://s3.amazonaws.com/tipikaxe/escort_passport_9500ix_platinum_radar_laser_detector.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_3f2c22ac10ee419e8ca1754721efc01f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/507bd36e-5d65-48b0-9df5-a8a51dd55a00/asus_p6x58d-e_atx_lga1366_motherboard.pdf
    • https://uploads.strikinglycdn.com/files/c3ab835c-226b-4a38-afd8-fa112f862ed0/59844001601.pdf
    • https://s3.amazonaws.com/verirejon/24260337169.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabb.bin
9f1e27baad8ead87e8c259f299a7fb77f01346e9270527120b15cc3484b33632		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 4892 bytes
font_01_sfnt_off0000db57.bin
16512f6d3a4bdfd02585bc587360abbb9fc45e4a97904a925ca951843bc8a49f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 11172 bytes
font_02_sfnt_off0001018f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 4324 bytes

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