Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc79c2855b9f1aa…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 20:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44177683499956c0a5d026fa6695602d SHA-1: d39dd2ec93ea6d94522d18d0d40393414b2dbc18 SHA-256: ddc79c2855b9f1aae2df149c984440fe3bb2e7952a18db0e4779c75c6b950c84
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and numerous links to PDF files on various domains suggests a phishing or malware distribution attempt. The document body was unreadable, but the heuristics and URLs point towards a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.aifimm.it/admin/inc/ckfinder/userfiles/files/zilape.pdf In PDF document text
    • http://smflow.in/admin/uploads/file/10999946226.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/midafekolawoni.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/mexor.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210902_435E14FADFF0B1BA.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/nezuvekosesit.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0023532001631709514.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/detubowuratogewerotabelem.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/toteriwadore.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/62680006202.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6133216c4f266.pdfIn PDF document text
    • http://hotechike.com/files/files/89840970693.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/72427610984.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/12198094657.pdfIn PDF document text
    • https://adikketiga.com/contents/files/guzipepunituxukulixoxo.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/8134731655.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/volowape.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4f0q8dre4ksh94imelolaufd69/20065091129.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/84272092936.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56107308961.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/wetukuxepem.pdfIn PDF document text
    • http://scro.ru/pic/file/kiruzovolusanonuwibevoza.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/xozojepib.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429feee5495---90754115941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=prince+of+persia+3d+game+setup+downloadPDF 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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 16360 bytes
SHA-256: a19e024dffd271dc19239271c1f36e014cb2adf9e95728371a79380beaf7c8fb
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 11320 bytes
SHA-256: 9233067772deaa76af52443418c13271f3a2cdcd66f6dadd7d2feee84e219c86