Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70e3a1f37afe2ae…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 05:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 652bbc348bd09052d5c86c4b0ba1fe22 SHA-1: 234b4da0bc9b8a9a88618c20e7dfd26041f14464 SHA-256: c70e3a1f37afe2ae8ab2d7cf614b401dcd90e3ed7f5e046236f1a230bf67f6d1
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 to benign-looking documents, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains metadata related to 'Fagor pressure cooker repair' and the wkhtmltopdf tool, indicating a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=fagor+pressure+cooker+repair
    • https://cdn.sqhk.co/narulaloro/Dibejbl/chromecast_extension_for_chrome_android.pdf
    • https://cdn-cms.f-static.net/uploads/4445557/normal_603f5134e9c7c.pdf
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/84413.pdf
    • https://cdn.sqhk.co/nimuxugemu/e7idiek/inside_the_black_box_book_summary.pdf
    • https://cdn.sqhk.co/gixotagokezu/hgfhieJ/financial_performance_report.pdf
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/be5ed0.pdf
    • http://jaxaxanukijomel.22web.org/champakulam_thachan_malayalam_movie_song.pdf
    • https://cdn.sqhk.co/bajowekununa/TjcEXih/50059195515.pdf
    • https://cdn.sqhk.co/nupozifulija/ie9jduO/30711922619.pdf
    • https://cdn.sqhk.co/jifibipex/iaihhbA/plasma_live_wallpaper_program_windows_10.pdf
    • https://cdn.sqhk.co/kapopuvida/1ii9gjD/67344582684.pdf
    • https://cdn.sqhk.co/bemememu/gDnfgdi/dusafenogonaxejakelip.pdf
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fc5e77323938.pdf
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fd0576ceccf4.pdf
    • https://cdn-cms.f-static.net/uploads/4427097/normal_60155751a8f90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivamubug/bass_guitar_fretboard_template.pdf
    • https://s3.amazonaws.com/viregujipowuru/kegupezemarujip.pdf
    • http://magetamuwunaze.rf.gd/boy_story_too_busy.pdf
    • http://pumumiz.epizy.com/gukevajilalelo.pdf
    • http://vozapubivazub.rf.gd/diablo_2_patch_1.13_download.pdf
    • https://s3.amazonaws.com/jarawaxanivu/memento_mori_jonathan_nolan_espaol.pdf
    • http://tekoboworitutew.epizy.com/action_jackson_hd.pdf
    • https://s3.amazonaws.com/zafirawit/titisatiredupisibun.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_off0000f896.bin
59b90ebbd70af3bfa9496059cfead9f41a7687a7300bd3364780eb7a6dfced7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5088 bytes
font_01_sfnt_off00010a02.bin
566343dd0c8f32b6a067255f5bad718cc78ef3c09a2ea0464bd15f711497666b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 11004 bytes

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