Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1cbbd6e772cac3…

MALICIOUS

PDF

81.9 KB Created: 2021-06-01 03:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf84127db63564d226faeb70c05ef2e SHA-1: 152bcaaaa122ea2cc20fb91b1f3e4c91adfce4a9 SHA-256: df1cbbd6e772cac350b43d008a7b9e4b7c3d0d81e57f5ab50db4b350a503f36b
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading files. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/pbw?utm_term=spider+man+1+movie+google+docs
    • https://cdn-cms.f-static.net/uploads/4414695/normal_603b7b79a777d.pdf
    • https://garowenin.weebly.com/uploads/1/3/4/6/134662298/65f0ec176312.pdf
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/nusejagu.pdf
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/kokomegud_lunokowovov.pdf
    • https://kowedogade.weebly.com/uploads/1/3/4/8/134879104/8eab13f0ef65.pdf
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/joruzekalon-pufeva.pdf
    • https://tujakiko.weebly.com/uploads/1/3/0/8/130814553/4574197.pdf
    • https://static.s123-cdn-static-d.com/uploads/4371800/normal_60b0d3a4f0c37.pdf
    • https://cdn-cms.f-static.net/uploads/4375887/normal_602aed12d932d.pdf
    • https://cdn-cms.f-static.net/uploads/4375204/normal_601867eb341f9.pdf
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/mupaw.pdf
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/113747.pdf
    • https://cdn-cms.f-static.net/uploads/4493610/normal_602f2d12e9f10.pdf
    • https://genopajixon.weebly.com/uploads/1/3/1/4/131452954/6338413.pdf
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6069395c176bd.pdf
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5feb15f017d1f.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_6050d49201271.pdf
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/6613775.pdf
    • https://zematuwarun.weebly.com/uploads/1/3/4/3/134327873/3397741.pdf
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/zizapetexetenexil.pdf
    • https://sovakevu.weebly.com/uploads/1/3/4/3/134341498/bevim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144438060/kabezuritono.pdf
    • http://vatojorisa.pbworks.com/w/file/fetch/144434910/what_is_alphatrak_control_solution.pdf
    • http://wuvebag.pbworks.com/f/wijujagiwisegakoninowekit.pdf
    • 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_off0000fd71.bin
b3292e666434085e6f6cf4408e44b23c199e0c951d1ef5496688a918943a6036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 5608 bytes
font_01_sfnt_off00011077.bin
0f1ce968082de504147f6155df51c5dabb500b965ba1dae6322e2a22ca6f35fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 12420 bytes

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