Malicious PDF — malware analysis report

Static analysis result for SHA-256 876dff14c904c00d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 22:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64e523db843952ad8ca54fe73616060f SHA-1: 813e855e7d7cb07e7ed4af56a26e0cb7cf5013f2 SHA-256: 876dff14c904c00dbd2fc402338156ee16859bdcb3a7b9326bd4871d72ee0a8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it's designed to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://srmhomes.com/images/bulk_images/files/varuzofetodegexutup.pdf In PDF document text
    • http://grabnerestriche.at/65765990414.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767f2b426d---38051768550.pdfIn PDF document text
    • http://simoncaulkin.com/images/62799937506.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/nilalijomifumuluwup.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/gapubafudorimana.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/57532989597.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/51697104390.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bumimesavazezawiwa.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/7450563331.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01a944765---pugaziw.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/bivulinelofusanopokiriwad.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/54232143554.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/miteninofujexet.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/83697176070.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/sopurebixide.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/dupexibezefudusobukupa.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/fegetikojixugiwe.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/36607856621.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/79388760412.pdfIn PDF document text
    • http://creationart.hu/files/file/ladolinukusulaj.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/jajivijunidovobivesaviva.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/41448252247.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/36616868831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jungle+cruise+free+full+movie+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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 16144 bytes
SHA-256: dd4400b76f181af8dccbe6654253d4bcd139e5bdeca1c18039ad452c1661c833
font_01_sfnt_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 10576 bytes
SHA-256: 3231398980ecf1447cc9cc760cf482ce63a80008bf395a65e7f05359cea25590