Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08ae89ca07dc2a1…

MALICIOUS

PDF

79.8 KB Created: 2021-06-02 20:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04b57de8521f18f5ddd49d22d911bfcd SHA-1: d7457510a7b6b6686ba2f94a5037cce4fc5941e7 SHA-256: c08ae89ca07dc2a1b10b4d261cbe944dc040a3af2fc006c8a0911dc54dc0da6a
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to attract users interested in game mods. The presence of a direct link to a potentially malicious URL and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/pbw?utm_term=rise+of+kingdoms+lost+crusade+mod+apk
    • https://cdn-cms.f-static.net/uploads/4504870/normal_6056dd855ff55.pdf
    • https://cdn-cms.f-static.net/uploads/4401983/normal_603f917deee21.pdf
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/a089996bed.pdf
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/7d482af85e77.pdf
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/9841488.pdf
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/gomokiworet.pdf
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5feb637c1e18a.pdf
    • https://muvaxajipafe.weebly.com/uploads/1/3/5/3/135313420/6001929.pdf
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fc73c2092607.pdf
    • https://lolugaze.weebly.com/uploads/1/3/4/6/134656459/sutoviz_fumanevasunit_xifunedu.pdf
    • https://watuluvijigu.weebly.com/uploads/1/3/3/9/133997483/petetimupogixir-kutasunegutu-sokala.pdf
    • https://static.s123-cdn-static.com/uploads/4405907/normal_5ff79e4df2806.pdf
    • https://katubebadidi.weebly.com/uploads/1/3/4/4/134474785/gaselajif.pdf
    • https://cdn-cms.f-static.net/uploads/4383321/normal_6064718f59d70.pdf
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/461729.pdf
    • https://cdn-cms.f-static.net/uploads/4485568/normal_601ce8f152016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gulisapil.pbworks.com/f/how_to_write_daily_progress_report.pdf
    • http://zeladejan.pbworks.com/f/47384122381.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144474303/58208723554.pdf
    • http://juvupumanut.pbworks.com/f/10568925265.pdf
    • http://mujefapufefi.pbworks.com/f/congressional_committees_questions_worksheet.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c4.bin
528370b89288a43514ce99bd71a74771b7f944f133c424755456f0be27277f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 5544 bytes
font_01_sfnt_off0000f699.bin
8bbdde1a1409a3988c3b16c451b111560c3a0a1a4ee3bf00a9e6eff9d6753594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 10976 bytes
font_02_sfnt_off00011c8d.bin
fce21d86c2b5faa43a5619d6c859002d414ef8720c10ef6ba746f045f1b0bfa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 16076 bytes

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