Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6966418af4f2c…

MALICIOUS

PDF

77.7 KB Created: 2021-10-16 18:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ffecf3f42487d3d20bb845b39187579 SHA-1: 00102a53ca4a05c72ecd89481256b60b2b5dc55a SHA-256: e3c6966418af4f2c2247b357e3327b835986365e2588e9d9adc47ce29e5bf36a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bumsnab.ru/uploads/files/42152212220.pdf In PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pozirusuzigonudotuki.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/18614836623.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fazuboxagivigejebolerewu.pdfIn PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/jojixojivanez.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/gibobifo.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/taderozemixigana.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156a4cbeca3e---fidiwar.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210910_124725.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/nowomakesewevor.pdfIn PDF document text
    • https://sd-olimp.hr/files/5893656891.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/90202056572.pdfIn PDF document text
    • http://www.heksan.com.pl/file/newavani.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/88503444533.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/mututenodaxosevijazi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dugisilebovafot.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/vevetawojewobugopusive.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/tolafatamesugojapuzadupil.pdfIn PDF document text
    • http://grandfiltr.com/files/file/35566731598.pdfIn PDF document text
    • http://nineslash.com/user_file/file/saludosikokuzaw.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/46966718061.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/nidunukanatifikomu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=160+pounds+to+us+dollarsPDF link annotation
    • http://forum-auto.ru/data/files/xitaluputosal.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 10504 bytes
SHA-256: 4ee83d5cc7b3c091f4a639d6860c22fbb9a44aab07698db89ce5f61a6739bb37
font_02_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 18372 bytes
SHA-256: 2f0ca601c94472c6828be899c6ea27c8b5626ae842a847c66d8f3a54766c0459

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