Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b10266f6f657c69…

MALICIOUS

PDF

78.2 KB Created: 2021-03-04 23:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1154bea70bd78dd557db6024949b6d0b SHA-1: cea31be94aff4057613fd6637f5175f5a8dd3fe5 SHA-256: 0b10266f6f657c69f8b0cae8b7483507d7d325efde67000eed961d0579f68aa2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/aws?utm_term=how+to+change+thermostat+from+cool+to+heat PDF link annotation
    • https://cdn.sqhk.co/tifapoxur/VjcYS2A/12824713188.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/dAZTIUR/flame_hero_game_download.pdfIn PDF document text
    • http://edapog.online/josefoxewafasmi6f.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/what_should_you_know_before_buying_a_used_car.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/place_value_worksheets_for_grade_1.pdfIn PDF document text
    • http://qqkaxes.xyz/872207432474gswa.pdfIn PDF document text
    • http://potenciy.xyz/all_the_chickens_come_home_to_roost_meaningulia6.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/fovoravukurosep-kuzada.pdfIn PDF document text
    • https://tivafalaxemi.weebly.com/uploads/1/3/0/7/130775521/xosoraxatenid_korapovumu_nawapox.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/jehfUhi/find_network_switch_mac_address.pdfIn PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/jegimofetefexejufogo.pdfIn PDF document text
    • http://forecast.bet/verazokimipixibi64y23.pdfIn PDF document text
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/japirujumeperuwogabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_9684c7abddf4462f83cc0ac68c12563f.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_f5fcb0ac29cc410ea80f924f8b0fedd6.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_c1b9a1130d3c41349864d79b02822271.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_914fad8d63ae491fa64abcc2f6b9ac18.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_d325b33bf19c441e95f6dee973ae8b4b.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_cc5f747c772d42c996a980f6613d8743.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_238ca3a6ec5e4cada0b1f4d0f23839e7.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_591b20f3d1334ad9a61d81416be4dae9.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_1e83e1eb02a1426c9d40b175a7791dd8.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/wii_error_message_50299.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_9cfb4fe9d34e42039e029711f12eff97.pdf?index=trueIn 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_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 5348 bytes
SHA-256: f93e99eed5694032da0723c07136519057b86a6a08edc53cc8489d9ba76aa1e6
font_01_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 10196 bytes
SHA-256: e03da363da0b735ebeb7ffbfaf0094ab0ecc7c8e2bfdde37cc79db48a906f914

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