Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4443393d4249f4…

MALICIOUS

PDF

86.1 KB Created: 2021-03-20 22:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6ce7fc1633194d0ef9762299ae2df8ff SHA-1: c0b293195eadace24765a9da5b68641488ca7f47 SHA-256: 4a4443393d4249f408f4d3fa773cc64aa1d1a01f288b0fda254c6292de062460
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to obscure the true malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards a social engineering attack to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=binomial+theorem+iit+jee+pdf PDF link annotation
    • http://patajafurep.mywebcommunity.org/vaxakisafitosigojejo.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/hdhfjbh/limuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_6051a5fc1dba9.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/b7Y6BCY/warhammer_2_best_magic_lores.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/hcjjw4D/74438727189.pdfIn PDF document text
    • http://salea.site/tomelinimu4f8sx.pdfIn PDF document text
    • http://helpverifedbadges.com/83639227411juf0r.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/how_to_write_essays_for_university.pdfIn PDF document text
    • http://prodive.su/tosatuzimanadifikafofawadlzfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_600744f57d12b.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/cqhaSLk/south_australia_road_death_toll_2020.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://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_956ad56fbb7642f9bf9da5b40fb23444.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/weekly_weather_report_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/deacon_ordination_certificate_template.pdfIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/behavior_modification_therapy.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_f126f7ea49224434b9f65580181dae55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/53390995478.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_c460709794194737ae47a6880ad3c783.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_de2c4ae93e104799b4e5b5d544605953.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/deadpool_2_cast_parents_guide.pdfIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/nenunirab.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/how_to_charge_a_ring_power_pack.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_16f9501bbec04102840d82fa1d7ee785.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 5016 bytes
SHA-256: 1b62ce9b4677a11f60e98c493f17fc04f37bbd45d1ef16ea3517e6843255a7b9
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 11632 bytes
SHA-256: 93eb8ffa4adef39c13d33d860df214314a2cfa27f61df7c8cba3f4ee25d4859b
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 16284 bytes
SHA-256: 1a73c881f62066aa5df61130629e89092d126b14536463fd2f459c0406b42137
font_03_sfnt_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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