Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8aa85fec9d7ad9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c21cdb3805d62c730b1c7f9947ea5118 SHA-1: 0beb4a3f71411f25393fc62ab71a2787941b4c76 SHA-256: 4e8aa85fec9d7ad97fdafe963d32256052354e97320a891279226e88b18082e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.beautyvogue.ch/Files/file/53848202365.pdf
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/17703331338.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/13790344006.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/wopusijizak.pdf
    • https://tecnibat.net/uploads/archivos/ravubejajoxizozaka.pdf
    • http://radecznica.pl/userfiles/file/85577450437.pdf
    • http://9262895.ru/ckfinder/userfiles/files/zaputamatonuba.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5ca024d5073707a9ff6e1912eb741abd/bogigadawedu.pdf
    • http://reicar.dk/userfiles/file/xotizuvew.pdf
    • http://thuexe7cho.vn/upload/files/tupitutetisojelolido.pdf
    • https://promtour-rural.ro/userfiles/file/96300853583.pdf
    • http://namthangbasaltstone.com/uploads/image/files/takakapakoditolasavi.pdf
    • http://idcla.net/upload/files/xenejuwelitetavudi.pdf
    • http://immobilieninvestors.eu/userfiles/file/rozokowupugefepigubipi.pdf
    • https://pingthye.com/userfiles/files/2340358299.pdf
    • http://annabarons.lv/files/files/69318481871.pdf
    • https://advance-pack.com/editor_upload/file/pimemitigujutujime.pdf
    • http://mehmetrasimmutlu.com/icerik/file/57341910258.pdf
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/55704575626.pdf
    • http://elencostruzioni.it/userfiles/files/lenilagasebikumusole.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/72602258785.pdf
    • http://giaexploring.it/userfiles/files/dexowovebemu.pdf
    • http://wakesup.org/userfiles/file/14465822793.pdf
    • http://kristiankutschera.de/userfiles/file/nagetedesezuxixaferagus.pdf
    • http://budaors.varosom.hu/userfiles/files/dudisu.pdf
    • http://aftp.bg/userfiles/file/borafazigoxirudugurewi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wifi+password+not+valid+android+box
    • 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://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_off0000cf74.bin
2f0ba6d08885bea10689f9d096884dccece3283df72d0c3bbf5a7df5d79488be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 10748 bytes
font_01_sfnt_off0000e81a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 16792 bytes
font_02_sfnt_off0001002c.bin
7ad66acbb9a940b77c2e9b9f4c59cfdc66f09ace2ec51fa7ee5574785d366fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 17232 bytes

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