Malicious PDF — malware analysis report

Static analysis result for SHA-256 53dd507804eb934c…

MALICIOUS

PDF

111.5 KB Created: 2021-09-20 05:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8a2d82fc34a9a3d872f7b7e5683e86c SHA-1: ece6aa763d88afa650bdb04538d5722b727e8f98 SHA-256: 53dd507804eb934c479370275b5afd8f2f2e1591de2e3ad48044f1ca7e4c170c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'disposable link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://kzlo.pl/fotki/fotki/file/wobomowenimanof.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613481d36cc96---xenitibibovubuxisara.pdfIn PDF document text
    • https://majubesar.org/contents/files/teduvitebezizopuwokilavol.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/binawigoxarumagovosevuza.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/44896959482.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/57372406123.pdfIn PDF document text
    • http://samtekelektrik.com/files/97314710242.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/22890502978.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/54019775629.pdfIn PDF document text
    • http://wohingltd.com/userfiles/85756062475.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/2079581386.pdfIn PDF document text
    • http://idcla.net/upload/files/muriw.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/73329693347.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/19951441902.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/96731433257.pdfIn PDF document text
    • http://skncn.com/u/files/50107169959.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fadelisisogekumozowetedud.pdfIn PDF document text
    • https://hinaweb.com/upload/file/51752231204.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/guwofemujuxara.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kixugosiviwetolapo.pdfIn PDF document text
    • https://majubesar.info/contents/files/77260388636.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51907882668.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/guzozipizobifibe.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf0e09486---20109341494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fear+the+walking+dead+season+6+episode+16+free+onlinePDF 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_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 19312 bytes
SHA-256: 50bf14c590876eb9c70e5f1060bc81462e22b3b74399c7f740e9b57c18e77c9b
font_01_sfnt_off00017dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000195d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195D8 11152 bytes
SHA-256: fcd4303e647189637cc6488aaa55cb65b260480d8b28a3bae863b7e3ae8c3e79