Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b5b883f1dc0ce7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 11:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35fbd6f729aa1aad828410ce6aba1317 SHA-1: a497f71399d06982707c21327014ec86bcae01de SHA-256: 73b5b883f1dc0ce7776851de81bd56b2b2dd9160185381095a3f8a9450e46493
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The document contains numerous embedded URLs, many of which point to suspicious PDF files on various domains. This suggests a phishing or malware distribution campaign where the PDF acts as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://playonathletics.com/userfiles/file/59456604734.pdf In PDF document text
    • https://maymac.info/userfiles/file/sojivedi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/73027458285.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/33987296054.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae3f85d5f---jidisi.pdfIn PDF document text
    • http://viorina-deko.com/images/file/58197648367.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/nozanevarojawixawumutu.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jafokuler.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/54404876365.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/1216337816.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376fecd9a48---74614264190.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/57988946731.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/96746393670.pdfIn PDF document text
    • http://salespate.com/userfiles/file/18161070879.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613062b552ecb---4898357014.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/pawomofudipimaxowunetuvam.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/45327850948.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/levegenerorid.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/99146150046.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/tajijozuwisi.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210905002919.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/topokaxuwizusok.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/6038425276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=slim+smartphone+in+bangladesh+2021PDF 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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 17700 bytes
SHA-256: 01f9b28e58e6196a46a2bf92ed9d4121c7792f43f803a30f48b4404258423460
font_02_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 11348 bytes
SHA-256: b7a9d8f6789d9f1540f546a511048ebf0e64e36358ed31a6d38d3270ae5b5076

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