Malicious PDF — malware analysis report

Static analysis result for SHA-256 2987150e5c99f775…

MALICIOUS

PDF

78.9 KB Created: 2021-03-29 16:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff6a21209fedc18d46a24085783a231e SHA-1: 1f723b7f9d49f37398b28fbae0a09f0a7f3b1c44 SHA-256: 2987150e5c99f7759855d645532295c7ac32aa9b04408ed76295002469ce0835
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 relevant search results, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing a secondary payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=waste+to+energy+technologies+and+global+applications+pdf
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5fd13d9fe0d6b.pdf
    • http://tizuwaborew.22web.org/bsf_constable_recruitment_2020_application_form.pdf
    • https://cdn-cms.f-static.net/uploads/4450140/normal_60346ea873e62.pdf
    • https://static.s123-cdn-static.com/uploads/4482406/normal_5ffcb069831b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lekelepowo/clases_de_sistemas_operativos_para_moviles.pdf
    • https://s3.amazonaws.com/kuxuxemu/voribaxizus.pdf
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_770d2f07c4604a81801de234c186fdf7.pdf?index=true
    • https://s3.amazonaws.com/getizar/76146743223.pdf
    • https://s3.amazonaws.com/mujesogi/ritore.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/worksheets_english_comprehension_grade_7.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_e42fb30a822747b4aeb5e9df1b0fd7c2.pdf?index=true
    • http://vejemomase.epizy.com/search_button_toolbar_android.pdf
    • https://s3.amazonaws.com/donarepemi/where_to_add_transmission_fluid_honda_civic.pdf
    • http://luzeparuzibez.rf.gd/linoruwisudituxofuvawev.pdf
    • http://balunepikejevo.rf.gd/pdf_annotation_editor.pdf
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_dca19763d4244a4794b5ed6de6760170.pdf?index=true
    • http://jugebifa.epizy.com/gulubupexutewuwunilulak.pdf
    • https://s3.amazonaws.com/xukonakefules/surah_al_kahf_english.pdf
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_62b47bdd61c641b6a71f24744580acde.pdf?index=true
    • 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_off0000f29f.bin
3ce370c94767528556e4c982df6143976bb13b130cccc7dc3809acbe08cc5c12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 5672 bytes
font_01_sfnt_off00010601.bin
e8f86e27f055a3f262035a5b8fd3a3ae5fd7d530c17536f71345b96ccdbdbd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 11120 bytes

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