Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fa6368b4a82da3…

MALICIOUS

PDF

91.1 KB Created: 2021-03-09 02:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b441c417a27531f85ddeac57b89342 SHA-1: 9478de3161e20e1435c12c1acea46f2f9ea81dde SHA-256: 26fa6368b4a82da3e7714b237344d33210223dbba650c8b79978899477d5f1fc
156 Risk Score

Malware Insights

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

This PDF document is identified as a phishing trojan by multiple heuristics and a machine learning classifier. It contains numerous external links, including a primary link to 'vilenefex.ru', suggesting an attempt to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of external links and the ClamAV detection strongly indicate a malicious intent, likely to deliver a secondary payload or phish for credentials.

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/award?keyword=identify+font+in+pdf+online
    • https://cdn.sqhk.co/vujejanar/hdj8A5T/bidavinovuvizuwubemasavew.pdf
    • http://prod-fruit.space/modified_proctor_test_lab_reportl59m6.pdf
    • http://belplitka.ru/xuvojons9p1a.pdf
    • http://zupaxowo.22web.org/3d_photo_android_app.pdf
    • https://cdn.sqhk.co/mibajufaneja/epjabii/lokupobeka.pdf
    • https://cdn.sqhk.co/boxoveru/bAhbEjd/vinaboy_advance_gba_emulator_download.pdf
    • http://picsonair.com/toddlers_short_bedtime_stories_youtubef8l6j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad0837cb-ddf9-43fe-b80a-672468292f13/taxebopozijax.pdf
    • https://uploads.strikinglycdn.com/files/ff5b1db1-66f9-4abf-90f1-f618b03bd451/medicaid_doctors_in_dewitt_michigan.pdf
    • https://s3.amazonaws.com/regovadeje/how_to_create_website_using_wordpress.pdf
    • https://uploads.strikinglycdn.com/files/4d3bf364-6892-49e0-b18e-5bcf0a9d2668/yoga_mudras.pdf
    • https://s3.amazonaws.com/gozilum/certificato_di_conformita_ministero_della_salute.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_38fb14c2934e4aab9d1759cd7bdbb5aa.pdf?index=true
    • http://joxepivebafugig.epizy.com/valutu.pdf
    • https://uploads.strikinglycdn.com/files/bd2f42f4-78b3-4809-b7ee-238272404a19/poulan_pro_20_inch_50cc_chainsaw_pp5020av.pdf
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_0bdafbbcf4fd4e529ccec2eb8ef2cf71.pdf?index=true
    • https://s3.amazonaws.com/gelawiweza/96821221357.pdf
    • https://uploads.strikinglycdn.com/files/688ccc9b-4844-4eba-b75a-20ee58097413/xovokokajume.pdf
    • https://s3.amazonaws.com/mesixadelomomo/digi_003_drivers_yosemite.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_off00012a88.bin
b28ba3fede5b4e7d8913ee5a3741e64289a55d0b13aa5d562683fe5ff06a90a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 4588 bytes
font_01_sfnt_off00013a47.bin
63153877f945a1f70a16be33e96576c01729aef1e32a39226de0eaf211fb9bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A47 10844 bytes

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