Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48da76ea544ae69…

MALICIOUS

PDF

72.3 KB Created: 2021-03-22 17:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e14a78584f9fba449746d22f1b4fa7b SHA-1: 12c3c06450910f0f49adb8c340b6c8477c65c305 SHA-256: c48da76ea544ae6946a10f99ec887740bce74f5d3f885cace23ce846e7e67efd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wix?keyword=14+points+and+treaty+of+versailles+worksheet PDF link annotation
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/tufivaviloxodire.pdfIn PDF document text
    • http://meetplafond.xyz/montessori_flags_of_the_world_printableielu0.pdfIn PDF document text
    • http://frukt.fun/63529203327ry4lv.pdfIn PDF document text
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/2717134.pdfIn PDF document text
    • http://dontbeshy.xyz/what_is_wsdl_in_web_servicevu3nb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_5fd61c12ae88a.pdfIn PDF document text
    • http://pss77.ru/sperry_dm-350a_multimeterfd7co.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/9c589587e01b79.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/Whg9jis/sound_effects_for_youtube_videos_mp3_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_601fc48a23e93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_60093964c9491.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/hegeicw/xidedafuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/hhihihg/hip_hop_dance_music_definition.pdfIn PDF document text
    • http://eu-study.ru/child_care_center_director_daily_schedulevf6sn.pdfIn PDF document text
    • https://folozulo.weebly.com/uploads/1/3/5/3/135351090/8719971.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/EUqUhfP/20979069712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5fd0a31a71093.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_564bfbe16acf4560ab479eb99e90fcf7.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_7175708da4fe48bfbcb2df2d5d04283b.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_e920424ef59a421181366f9c349604d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b9165b-d95b-4419-b433-f32531dcc6c4/29101826540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d001e8cf-2966-472e-953c-feb87819d079/how_to_activate_ellipsis_jetpack_verizon.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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 5492 bytes
SHA-256: 6c90282157eaace46b0c93b481ad3679b6cec8c51f041c1dbb599b37ce2e5c3e
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 11144 bytes
SHA-256: d017e607e7e24c42b26953b7a2cb21b1b344155fc309e18f29aa45a870ea9057