Malicious PDF — malware analysis report

Static analysis result for SHA-256 951f25f195abda3a…

MALICIOUS

PDF

98.2 KB Created: 2021-03-16 01:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 08e1d05673a72786c6a324047795856a SHA-1: 2161d635975960b5ff0f4444fce1fd3b765dc62b SHA-256: 951f25f195abda3a15b659fe3e97b1f09f0c530c55fedc756b22fa5b55c6bc2a
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains and are likely part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, appears to contain search terms related to a high school football schedule, suggesting a lure to attract users to these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/wix?keyword=mt+vernon+il+high+school+football+schedule PDF link annotation
    • http://koprovk.xyz/subway_sandwiches_calorie_calculator72301.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/ciiEeek/xowogasunigugin.pdfIn PDF document text
    • http://top-agent.ru/what_packages_does_dish_tv_offer0gntt.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/2631370.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/2502672.pdfIn PDF document text
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/baxasinamiri-kewilikogavat.pdfIn PDF document text
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/2450321.pdfIn PDF document text
    • http://nosinoski.shop/5713303387hmase.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/6578867.pdfIn PDF document text
    • http://disclosures.space/83094516468tm02r.pdfIn PDF document text
    • https://cdn.sqhk.co/momebuman/R4v7qaC/download_street_fighter_4_champion_edition_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/1jbhbt6/yandex_money_apple_pay.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/DvnSheS/free_gems_brawl_stars_2020_deutsch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9dbf3295-60af-42bd-9aef-a394d2b3b92a/doduvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af9fa43-f7c8-489c-9295-299dc207f7fc/96888960902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9595c4d-45e7-48f1-a681-c7309bfc2e47/wufilowozalaxagegi.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_96c876d504be475eb6d8447844ba7dd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3427d3fd-0eb5-4291-84e1-a95200bb5ae0/monash_university_fodmap_liste_aliments.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_c6e7ccc3758e41fea559a99ee1fea126.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_dfed35c5d582499e90f6ae9de22e4d92.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_e3cfe3e98fe14f56a1f1f0d025d272df.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_fef38ed8e7034c05a7d6c84aab3c269b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a95ed01-5860-4571-9045-823aafdf0e29/real_analysis_royden_solutions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 5372 bytes
SHA-256: 051cb4683d1ccd32a45c3fbd0965797490e294ff23797f36fd1026781efb6e01
font_01_sfnt_off00014403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14403 12016 bytes
SHA-256: 9c22c84d6a4a8cec26625c95b3ee05b31dcba87022606de31362bbb49de3fabf
font_02_sfnt_off00016ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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