Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5616e214be7a4c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 09:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de32ebf555d31e2e02ed898e5d488e83 SHA-1: 07d51bc65325f4ff7feb95bcd373fef3ce6f83b2 SHA-256: 5d5616e214be7a4c83cf463f3f0a626ef80ff0c78c7a746f5d70c2ef2ec208d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous external URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lure users through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/sepufilexujeferegib.pdf In PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/5538883943.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613156333ae74---47753894172.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/53365323806.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/43135210202.pdfIn PDF document text
    • http://ashioke.com/images/library/File/82817128720.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/39640692506.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/komagevududar.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bovapi.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/wubosuxaterigidovomojefax.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/lizujemimu.pdfIn PDF document text
    • http://retrofotr.cz/files/file/gegawesebuvisobip.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bdfc1c1d---mikuxaruzezuwepejibewe.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/82942563520.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210914190133.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/61770239468.pdfIn PDF document text
    • https://yifff.se/userfiles/file/lenegapivadigusut.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/90070012226.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/27106620858.pdfIn PDF document text
    • http://labonscafe.com/userfiles/16636054393.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630756316.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/85020858661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rpg+monster+viator+mod+apkPDF 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_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 17208 bytes
SHA-256: 8f5886ce01d857378d30962d8b9a84fe29bd7e1f42cf321cc7a50421f681c3b9
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 10892 bytes
SHA-256: 52dd3e92f3f99228e1d24f0d42ebb138a8abfc4df3521be9e0f02bd586232a49