Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b7679cea9cd8cf…

MALICIOUS

PDF

88.7 KB Created: 2021-02-18 13:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2e21806d55720464ceb7f65223f12fca SHA-1: 1237943c954d791a356b73c6ad295deae6b75fcf SHA-256: d3b7679cea9cd8cf9411f89283ae1954715139b6605245580f64ae67e15c8013
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a visual download button lure and numerous external links, one of which is a link farm on disposable hosting, suggests a phishing or social engineering attempt. The file's purpose is likely to trick the user into downloading a secondary payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/aws?utm_term=gta+san+andreas+cheats+computer+superman PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fd640dab5a84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374956/normal_5fc9f7942e723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490736/normal_5feb8a1e78206.pdfIn PDF document text
    • http://xaxifibipebux.iblogger.org/format_json_using_notepad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_60249cc5e057f.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/dTjghul/cisco_webex_meeting_mac_camera_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fe166922180e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcacac866d8d.pdfIn PDF document text
    • http://zawugexoj.22web.org/astro_on_the_go_di_android_box.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/lkgihdY/queen_greatest_hits_offline_full_album_youtube.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://s3.amazonaws.com/debamijizozexo/96680551364.pdfIn PDF document text
    • http://mimugewezis.rf.gd/what_is_microsoft_project_2019.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/counter_terrorist_2_hack_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/67656475300.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/42960123892.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/74277347925.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/fond_du_lac_reporter_breaking_news.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_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 5148 bytes
SHA-256: a9c34c1826e986d6fcada772da1d281de89c5d6fc445f070e998dcd14f32f1b9
font_01_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 11120 bytes
SHA-256: 8ea47cadfce7199dde73cb62670dab1e5a91ee0c408218fe8945ebe93c642f8b
font_02_sfnt_off00014787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14787 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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