Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6e89570f68b047…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 05:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: effa89ddb2ba7512991bb2704bf0db06 SHA-1: ac356f6a42fc51b511e71e6e49fe7e421e05273b SHA-256: 7f6e89570f68b047e22d3ff22149e3eb2876856a852d09072b4c9203db37964a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous external URLs, many of which are PDFs themselves. The presence of embedded URLs and the link farm behavior strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hearing-outlet.com/uploads/files/202109052205436851.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb88413c7---nikajevulajetasero.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/xosenasudi.pdfIn PDF document text
    • http://sdds.be/userfiles/file/76836722583.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/baa344871b1593bc0e04629c3f3bfbbf/63339842452.pdfIn PDF document text
    • http://schokobrunnen.com/idata/71295102892.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/93726903254.pdfIn PDF document text
    • https://izr.fr/files/lewinamamubaxemut.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/tipubumixawab.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/77824907367.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/78909095570.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/tiruvibaruwizuzigiviranin.pdfIn PDF document text
    • http://rld-carbon.com/file/gukidikefexoderajuji.pdfIn PDF document text
    • http://foodchemsino.com/d/files/vebenetiti.pdfIn PDF document text
    • http://samtekelektrik.com/files/25783925646.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/45299030068.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wipenuxiwemiwuwegusa.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/56724262937.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219333626.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/ragokorodozotirebewewivi.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908133711.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/3277782362.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mekenakunivodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shooter+full+movie+hdPDF 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_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10424 bytes
SHA-256: 2ecc501deafd5b0718a5baf70d57d8ba238a74cceed12208d81b435fd70132ed
font_02_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16864 bytes
SHA-256: 12655584dc3ed27c2b2fdd49a52cddbad31247229e7f6ef9156b603334cd1304

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