Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a63d618ea93917…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 18:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d82ab2bb08e5e5dd7ccdca1940e4e7f3 SHA-1: 8621d84d32a03e0aa5d42371b7b37bc95c2f92bd SHA-256: c1a63d618ea93917984c014d54e97f183caa264aa43834f3e48b9e778a3e3795
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable hosting, suggests it functions as a lure for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is designed to host numerous links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://crysiq.ru/uplcv?utm_term=invadir+android+pelo+ip PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bc55a8d8---tipevibajefupudaxe.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/90514491617.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/lolatefedikufirezerajo.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/38607314361.pdfIn PDF document text
    • http://josquin-capella.de/download/42046028222.pdfIn PDF document text
    • http://elskenecologie.nl/files/59419800718.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/feberipuxaxumasifoma.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091307264873499.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/58219024332.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/46396820135.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e18185b29---2889394581.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/keguka.pdfIn PDF document text
    • http://greenglobepms.com/uploads/42028933938.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/56263085484.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/47549401795.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/71830030507.pdfIn PDF document text
    • http://rsst77.ru/upload/files/45369059549.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/neremunapadazufajiden.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/jubipum.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/54019506962.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/najobif.pdfIn PDF document text
    • https://istanajp.net/contents/files/38913043115.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/zizozose.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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 10136 bytes
SHA-256: 286dd91864bf626bfa6a929f40634a86d7855b44211577e74bcc26aa85195e3a
font_01_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 18644 bytes
SHA-256: 485e3428d74f17314aa2bfaacbc3d3e7cdc1981ff55412907fcc16cf02a3b8eb
font_02_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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