Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d4089eb7279244…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 01:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 56b11afc5df74279b0c6b0e88435c6a9 SHA-1: d0f66dbfe5b218e0be39b7d9c9d3966425be9f43 SHA-256: 20d4089eb7279244eb354d87cc45ba37e560a4a9b68137e7d6d574930dcf7f19
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 disposable hosting and are likely part of a link farm designed to obscure malicious destinations. The primary malicious URL identified is 'https://pelibifir.ru/strik?utm_term=1080p+mini+dv+camera-sq11+hd', which is flagged as unknown reputation. Heuristics indicate a PDF link farm and ClamAV detection confirms it as Pdf.Phishing.Trojan. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=1080p+mini+dv+camera-sq11+hd PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1987c2f5-066c-406f-b1fe-0393f25b7fcb/zikibatavolusobuvewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e366673-bba9-4845-81ee-50bed79eebe4/ratubew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155c1ace-72fe-48df-a5a4-71eaf58b5d5d/char_broil_oil_less_turkey_fryer_assembly_instructions.pdfIn PDF document text
    • http://fidusigugowubo.epizy.com/software_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe549c78-b84f-44e7-a514-55b520482eb8/how_many_calories_in_a_western_omelette_without_cheese.pdfIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_fcf3cac865a14dc39746c3f598c60e6d.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_3fdc3da19cd648528618265124c21f8c.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_3b5c4f767110488b82a851c2e9908de6.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_e7d55bf17fa4465f88f75221ad06e81c.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_61e4dd4a83024fe1832c64e2ca239789.pdf?index=trueIn PDF document text
    • http://fukutinupamebo.rf.gd/sogunikowudujeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088aa90c-f1f8-4174-9e56-596433de3a04/tipos_de_organizacin_de_una_empresa_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25c2ba9-b222-4b84-ba3a-81d84a52c148/diburifuvefariwefolupegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c611ff46-ea8a-4c4f-b376-ad990b8cb434/jijugawasinurarazufona.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_9e525e8aab2a4f8c803ae38f311bdb88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/addb6407-f06d-48d5-b515-f45af2924432/what_army_units_are_considered_special_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01ae3c5-43ae-4946-b1ef-2d7bf880a9e4/what_does_columbia_the_gem_of_the_ocean_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a176af-8e2e-4490-a6d7-c1a3190e47c6/qu_puede_comer_un_diabtico.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_b1d861a17cd34e479acf455704132fac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a54ff2-cab7-4a88-8291-7a92f2516958/48044412780.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_7ea0af38d90440e09dd67f65ab089a64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0b769c-9e65-4e4d-b7e0-7b58743892ec/xawawetosoposag.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_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 5792 bytes
SHA-256: 0e2d44e3098f2641535d20ea54f10916b3d7de69f2fe046fc7369fa70d5c165e
font_01_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 13192 bytes
SHA-256: 43f1d6593cc6fd2775cecb846e70725be39f04ce278b3aa83907e28d9e03fdea

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