Malicious PDF — malware analysis report

Static analysis result for SHA-256 462d0094b6220d1c…

MALICIOUS

PDF

83.9 KB Created: 2021-03-14 22:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 521dc026fec8ddb7227b4db8597ee803 SHA-1: 9aa1b06bf4cfdc188dbb1c766b37c5231f2c34d1 SHA-256: 462d0094b6220d1cb091c464ed5bbd7f1515af9d6050b83f37ddd1013d2cb4d6
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'midufefew.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/wix?keyword=fulbright+personal+statement+examples+eta
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/veziraroxame.pdf
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/f8fd9c18af78.pdf
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6019c5037602f.pdf
    • http://mokemowowove.mygamesonline.org/94220008489.pdf
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5ff9a97b3f3e3.pdf
    • https://cdn-cms.f-static.net/uploads/4391047/normal_603ea095d13ca.pdf
    • https://cdn-cms.f-static.net/uploads/4368758/normal_604a61af9bdf1.pdf
    • https://govexofube.weebly.com/uploads/1/3/1/8/131872198/fb5aca50fdb941.pdf
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fd938f152b1a.pdf
    • https://sejiganabukuja.weebly.com/uploads/1/3/4/5/134585043/valobej.pdf
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/2459571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fukezavazuj/71462505797.pdf
    • https://s3.amazonaws.com/wofaxil/kexag.pdf
    • https://s3.amazonaws.com/warapagefasovi/what_does_fruit_of_the_poisonous_tree_mean.pdf
    • https://s3.amazonaws.com/zodawanuror/gibuxenunebowumafo.pdf
    • https://s3.amazonaws.com/xuzakob/latest_battery_saver_apk.pdf
    • https://s3.amazonaws.com/wujafivabipo/the_100_book_chapter_1_summary.pdf
    • https://s3.amazonaws.com/bajapovogam/lokofafadadosiga.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/25970429381.pdf
    • http://wififeju.atwebpages.com/legelexomewutonelul.pdf
    • https://s3.amazonaws.com/batiku/gutter_guards_consumer_reports.pdf
    • https://s3.amazonaws.com/wivunonovef/shadow_and_bone_cast_netflix.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_off0000f43c.bin
22ebd3d11f4a707721eab575faec0201295d5ab523cbb3b22d82b2f110ee9fa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 5396 bytes
font_01_sfnt_off00010670.bin
1a3646a29f024ae0a6df9356ba5829abbc92d27af0c544ed5e09a28bcc0bea0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 11156 bytes
font_02_sfnt_off00012ca7.bin
f60502fb507c904334c4e6f64201f20e056641c8e54386132246a428bdda64b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 16060 bytes

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