Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8b00c9193456d8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 03:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47cc92279a7c67c54a91f8d85182a6a6 SHA-1: 54b1d8bbd46809bfcd008eddc0fb6907190e4a89 SHA-256: ee8b00c9193456d84c7a66666966b358fdd3cef29f9c0597b27dcd1daca5bb92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of it being a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=oet+2.0+reading+samples+for+nurses+pdf+free+download PDF link annotation
    • http://vswet.ru/f/nisiwogiberagejudalatub.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/refatajegewatuwipunuza.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/feditupuraxizelelev.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/79177541194.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/16607746067.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rimokewezir.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/bemujilas.pdfIn PDF document text
    • https://cncunse.com/d/files/8024520175.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/kutar.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210914091531.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/63168997255.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/navovuxibegogodonirumadag.pdfIn PDF document text
    • http://w-mill.jp/images/file/57683170318.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/86183979279.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/13270752126.pdfIn PDF document text
    • http://melvin.cz/data/girovanolujimutavo.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/xavoto.pdfIn PDF document text
    • https://emenu.hu/editor_up/ninotulamadazabegosofatew.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/8834678611.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210903120233_gdgvm8.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/fusajelo.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/favubuj.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xabafevefuzekefisirorow.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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 17616 bytes
SHA-256: 290af22abbfc02f33b7e5ffe4ce843acc2cf95b756ff06379feb017cf69c38a2
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 11360 bytes
SHA-256: 3456c48b21d4394babf1362d33beb7c18cba22742d185f2206512b0ff211b524

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