Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bd2af9a25417fa…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 02:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c999016b0e22d5c9c7f4baddf7f6383 SHA-1: eebd0f6c37276760942b2e2dd2accc80866e087d SHA-256: 41bd2af9a25417fa7178c7a5f0f5dd62473f3e35ba159e90ac5500b3a5cf53d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as search results for popular content like movies. The primary malicious URL identified is vilenefex.ru, which is likely used for phishing or to serve further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://vilenefex.ru/wix?keyword=madea+family+reunion+play+full+movie+online
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/jisesinavuxefa-xogejarajeminuw-daredibi-tojedevivi.pdf
    • http://farvestnn.ru/maxuvotijusekajegug7c6zh.pdf
    • https://situtewazugigev.weebly.com/uploads/1/3/4/2/134265876/ruvufilukipe-pubadutiti-sumegemalotebob.pdf
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/8994836.pdf
    • http://form-lnstagramverificationbadge.com/grasping_gods_word_bookcdf9a.pdf
    • http://sodaapp.club/rafosmdi5y.pdf
    • http://montana-media.com/arduino_uno_starter_kit_guideong7y.pdf
    • http://graatorama.space/what_is_the_statute_of_limitations_on_statutory_rape_in_coloradoptw8k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_3df9fac200f74a49b1641cf341f0606e.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_f8dd9f21190f4112ab5d47237825f4c3.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_99a352046b9e43feaee660511b7c9f68.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_cedf77b1279f4be5bb82ec309f005a23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/34a6b7e2-12eb-4dd8-82d9-1c7696a1dbc0/33266400712.pdf
    • https://uploads.strikinglycdn.com/files/c2e7a1a2-f1e5-469d-ae93-855198c6fdd4/pills_to_get_her_in_the_mood_in_nigeria.pdf
    • https://uploads.strikinglycdn.com/files/e01c831d-e33a-48fc-ba20-4eb38bc20fd6/line_6_spider_v_240_head_review.pdf
    • https://uploads.strikinglycdn.com/files/009e96aa-f06c-421e-a343-e1243718e70b/40683604766.pdf
    • https://uploads.strikinglycdn.com/files/5fabefed-2afa-47a9-8eb7-2e40a32f76cd/17892069814.pdf
    • https://uploads.strikinglycdn.com/files/eafaf3b9-4f18-4301-a395-89a7f71e9071/32594806002.pdf
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_5087161721ec4fe591159bf4801b1c75.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7a717bf-737f-4298-9225-7e986b09e97e/how_to_write_2000_million_in_numbers.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_off0000ecea.bin
fc3c94123325af04f7fa8c7e6f980964bdcb4113760c6e2bca520d0561e72323		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 5176 bytes
font_01_sfnt_off0000fe8f.bin
109868e59265bbd1d220a52540f3f113eaec5e29d5d0e6ce3e77e3898f30eeb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 11060 bytes

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