Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c825032ae33f45…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 10:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 907f0c23db4d6c5fd66e17fd78536688 SHA-1: 4eed55e30d92f5a28fcd0386943ff361bebdfba4 SHA-256: 52c825032ae33f452866605a869c9202cbe7af6c552214e014a9aea61a34daf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to suspicious domains and are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest this PDF is intended to redirect users to malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/dekorilixuzo.pdf In PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/4272622400.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/tarojevijoxudoxekilez.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/sakezatozomapawuzipen.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/bipexiwujajoziribagobosak.pdfIn PDF document text
    • https://robodom.si/files_vsebine/mutexeremumivirinif.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/39069327575.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/nedijapixinosobimuxidi.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/96437368936.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/kapuvu.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/20104455534.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/pizunifoxipidadaritaj.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/68235334918.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/kagetupaluni.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/nadifevupudebovira.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/mejowikabig.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/69197669869.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/puzaduzubavopafulasomofoz.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/62274844842.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c64225c4e---nobisexabezozejebuxawosek.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210911_212516_195.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/1102192221.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/22092989638.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d8305ca4---zubib.pdfIn PDF document text
    • http://villkasz.hu/editor_up/9495912758.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/14810752669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=my+jump+2+apkPDF 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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 17740 bytes
SHA-256: 93167a6d23fcc64ff5b67777e7d16144b84218395cd7db998eea70a0d46ffc18
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 10100 bytes
SHA-256: 2f31f2a666172db38342138250e8fb58a91b40f3a3b8e7008392a9d55f3f4902
font_02_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1