Malicious PDF — malware analysis report

Static analysis result for SHA-256 801ccc7ba5aae400…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 10:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 852a9771d8c3ca42a8837f67287b0f2c SHA-1: 4840e70b3a02bfbcc2b6c4c105297e7716c75120 SHA-256: 801ccc7ba5aae400546f817e65b89c602cba646a2f4b8f99048c103082f94857
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=contra+apk+free+download PDF link annotation
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/gt4oe74he7msste4ds4op9olr4/88279228031.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/nobunuma.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/70794866288.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risuf.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/pexano.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/81610497235.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/15463842015.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/kezijifexejoxofivip.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/gugafofuj.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/babolipujinowigumune.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/tekofem.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/tudovedemegimufeket.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/72071235401.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/fakanu.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/filinosugotiwegutupaf.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/pukufamaxasej.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/61294032111.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16139616889c38---zipaguliwol.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/11b3cdaa37e832660da2b6705baef806/ropofudukige.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/48706484947.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/82141795651.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/bivejamedizolutexatugif.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xosarobokanojorogeled.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_off0000c144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 17988 bytes
SHA-256: 30128e23ad515c01180cca04b8d4647ef400e85df456df0f26081c70c4756d1a
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10440 bytes
SHA-256: c41a00f65ad9ddeff359b264574004005e8f8a3aef84ec8d12ccf1a0d259ec2a