Malicious PDF — malware analysis report

Static analysis result for SHA-256 4204b49f0e10bbe1…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 14:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f77f729f745c6e36696fe6772f7177e SHA-1: bd15609b9829c4417cd20c6fe9d21b35cb33e1e1 SHA-256: 4204b49f0e10bbe1981a8290a47cbe9675c98328c5fb45a46dc3586992fada3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The file's structure and numerous external links suggest it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://sipsak.nl/userfiles/file/mibirumusiweru.pdf In PDF document text
    • http://letresorellebio.it/userfiles/files/kiwoxufasat.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xajovusilo.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/jozapexilanikatew.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/gajubifawutobegowetu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/72899067290.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/6972876259.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/xamegubabulafiwafe.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/30040630532.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/80762888642.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/24325943966.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/munatafawofefanusedax.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dujafenipig.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210913173602.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jawewejafireni.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/28993490868.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/69179746543.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/56771867338.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/darotudoxevemotumitejem.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3cb608cf4dde57d698572553b5c12f00/36969975365.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///1846596038.pdfIn PDF document text
    • https://coil.hk/upload/files/54872698031.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/mizemiwedajifanixisok.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/26930375753.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/35825906218.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/lozekegagojatolixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=einstein+diary+pdfPDF link annotation
    • 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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 19908 bytes
SHA-256: b90f4e46266b6a69e155787f935526e39d2b97b21cd3ed0b318dee08cab669cf
font_01_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D08 10424 bytes
SHA-256: edac056982286c117fa7660172eadcafb9e46f4b5837bba872de91c67bb949ad