Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f92d5dc2797718…

MALICIOUS

PDF

77.2 KB Created: 2021-02-18 22:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2e1e5e09bb5f52a6e420b5687b8414c SHA-1: 413b0c5281dda68619d494274567f9b08c976ddf SHA-256: 85f92d5dc27977183231fa9893383e902603d3bafd6c3df9081182d456556a1a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=blank+text+copypasta'. This URL is likely used to lure the user to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF is a strong indicator of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=blank+text+copypasta
    • https://cdn-cms.f-static.net/uploads/4493221/normal_602aa680110a6.pdf
    • http://tiwenol.iblogger.org/54890458471.pdf
    • https://static.s123-cdn-static.com/uploads/4412762/normal_6000aceb45f3e.pdf
    • https://static.s123-cdn-static.com/uploads/4498702/normal_5fdde6660aabc.pdf
    • http://mijogunabisojil.iblogger.org/best_malayalam_songs_site.pdf
    • http://wegansit.space/xatofanawewovekulipifvsfl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/genukopapovixo/formatting_excel_sheet_using_vbscript.pdf
    • https://s3.amazonaws.com/waxegatulo/logo_brazil_dls_2018.pdf
    • https://s3.amazonaws.com/mufukep/heart_broken_punjabi_sad_song.pdf
    • https://s3.amazonaws.com/budovewesekaz/35093513827.pdf
    • https://s3.amazonaws.com/pazatuv/37210800931.pdf
    • http://burijudipo.epizy.com/72317318879.pdf
    • http://nabesazuxipuf.epizy.com/18769559346.pdf
    • https://s3.amazonaws.com/mipeboro/66121607394.pdf
    • https://s3.amazonaws.com/fapaga/sylvia_day_afterburn.pdf
    • http://kevusej.epizy.com/pudiganifud.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/laserjet_pro_m402n_user_guide.pdf
    • https://s3.amazonaws.com/xonobijikivo/fufakawosi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5d.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 2828 bytes
font_01_sfnt_off0000e557.bin
c84f4f5f9f6ee54eb9662265eaab68b925ca3dc05ff607da2a76cb4154fffd84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 4852 bytes
font_02_sfnt_off0000f5e9.bin
c7224a019b82f5408cf337136d14c57fb0b504b4ca9bb3efc7ad5b244dbc96b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10408 bytes
font_03_sfnt_off00011992.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 4324 bytes

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