Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b18bb0f1db537a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-30 23:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2014d539efa60d91421113bf59dd2c SHA-1: b18d4a27939a8e6ef2165ab8a3c80490e99d5824 SHA-256: 20b18bb0f1db537a67f7881e3ef26610fcd06440a8429390aafa19469f67ca59
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, including a primary link to 'baarspo.ru', suggesting an attempt to redirect users to malicious or deceptive content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/strik?utm_term=what+is+grounded+theory+in+qualitative+data+analysis
    • https://cdn.sqhk.co/zoxogatuv/jgNn3ic/kewafevodarofabuf.pdf
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fc7142d34863.pdf
    • https://cdn-cms.f-static.net/uploads/4450635/normal_605d3d4c2d387.pdf
    • https://cdn.sqhk.co/gixedomawa/M1rthj7/instagram_bio_arabic_fonts_copy_and_paste.pdf
    • https://cdn.sqhk.co/xinoxoxojib/icjfWie/kevoj.pdf
    • https://cdn-cms.f-static.net/uploads/4474987/normal_601d72a1eaadb.pdf
    • https://cdn.sqhk.co/ruzixapudel/ghaPXjg/6995687559.pdf
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fdf14a7d9d19.pdf
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5ff8b844e0bee.pdf
    • https://cdn.sqhk.co/zojixemem/ggigid9/greatest_hits_of_the_70s_80s_and_90s.pdf
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5ffe886aec0c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_8b44914fb2834a45aa1c2b608cda21ab.pdf?index=true
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_c41b2a4d9a6b4460bddd05e5bc769b5d.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/router_cisco_1921_datasheet.pdf
    • https://s3.amazonaws.com/fogibi/johanna_from_sweeney_todd_sheet_music.pdf
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_d8dd34a4978b49b79ad58cfaa7df58eb.pdf?index=true
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_6b334cb24aab46d4a22f3156253ee764.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_off0000ebeb.bin
fa195225bbc139f61e8f7de92a741cb96709492a97d319ec990f52721b2e142c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5388 bytes
font_01_sfnt_off0000fe46.bin
177c49163b4b04a1d5a3a1e8e3050563337f984be5a39b2a47a1d502bb142720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10864 bytes

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