Malicious PDF — malware analysis report

Static analysis result for SHA-256 83050e1f211ba159…

MALICIOUS

PDF

97.4 KB Created: 2021-03-29 23:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be6835e2b43288747fa2ec4f001497f2 SHA-1: 05fd17d866c0a3260c1bc2ac1e29facd759dfd7d SHA-256: 83050e1f211ba1594babc901be279c5faefb00924d4c3cb3d5b6acc14d9761a6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The primary URL suggests a lure related to a popular movie, likely to trick users into visiting a malicious site. ClamAV and ML classifiers confirm the malicious nature of the PDF, with the ML model outputting a high probability of maliciousness.

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://baarspo.ru/aws?utm_term=harry+potter+and+the+sorcerer%2527s+stone+full+movie+on+netflix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387411/normal_605ef3080e9d6.pdfIn PDF document text
    • http://nesadurem.22web.org/learn_how_to_start_investing_in_stocks.pdfIn PDF document text
    • http://1ux.site/can_i_install_sims_3_without_originqurwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_5fe87c417618d.pdfIn PDF document text
    • https://virekapowop.weebly.com/uploads/1/3/4/0/134013047/darutukelizipuditi.pdfIn PDF document text
    • http://digitalcalakk1.xyz/4102425450839pc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5ffcd3cd1526c.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/4029c.pdfIn PDF document text
    • http://minuette.me/40573990369fprzp.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/8fe64c.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/98b3ccd92a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_603445d785165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_600496a095da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485166/normal_603638bc9e363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5ffcb068193b6.pdfIn PDF document text
    • http://nusururak.22web.org/85895155656.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89e38ec3-4f9a-4901-8333-056bfd5bbc5c.filesusr.com/ugd/3df7a3_e59caca2d2bf440ebf5ddc6fd77a7b84.pdf?index=trueIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_900ff875a022454cb8c92e661a960263.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_a8671617fec2462da2f99473f205b79b.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_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 5044 bytes
SHA-256: a9dadbc97097b435bb275739b40f8dab1658c784a4f9d0d5068e1f2f50255a60
font_01_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 5620 bytes
SHA-256: af11eea8fd41c69313378f6ab3b0e171c204ecb1b7698f435883c4fc72baf2d9
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 13816 bytes
SHA-256: 703c062e999ce3562fe3e05780aedca78137bb1f49ead4d94d3735234741bb0f
font_03_sfnt_off00015f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F21 16884 bytes
SHA-256: 11fd5b78a0ddd7aadfbb4a1ca1c93ec9c5d01c4068326b34db84569d611475d7