Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff174cda3a943bb…

MALICIOUS

PDF

69.1 KB Created: 2021-09-13 01:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 914066a4ef26256ea3a8a4b3c517156c SHA-1: d424dcf817a2244a4846925b21840941b1c338e2 SHA-256: 8ff174cda3a943bba89f9aed652a2c727507ebfcd30892a636797f3b272b553f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=redmi+note+10+pro+max+launch+date+in+india+price PDF link annotation
    • http://peneleos.pl/userfiles/file/78024769131.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/toles.pdfIn PDF document text
    • http://starma.pl/files/file/rixamatudonuzu.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/98897773416.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/wawax.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/lirawera.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/gosakera.pdfIn PDF document text
    • http://coffee33.ru/archive/file/linub.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/38406453640.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb7693bc1---bewisaf.pdfIn PDF document text
    • http://naso10.com/userData/board/file/lekudibijixune.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/wudega.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/4052294074.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/8186357991.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/051215279597.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81851885202.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a5ca01d245c3f59f724023aed9a062df/kobik.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fugovosam.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/12033775530.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/32442342795.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/tetedagowevovuvopenesipa.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/fesixenogimuradaro.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_off0000ae74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68B 11032 bytes
SHA-256: 748f08c613c778413587bdc0ef3570b26bdde589452734ecc0d6dda839f55744
font_02_sfnt_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 15336 bytes
SHA-256: f455e83751e182910a31721ee8682f5d7900d1d009a517b8678b3b05ea2eb151

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