Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52feaf155717570…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 13:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2568f39d9b73b1676036598af2fcab15 SHA-1: 919939a6b1540685cb3e6a95076535fd48d9e247 SHA-256: a52feaf155717570e433082716b8041ab20c10559e8f0231120d6d35bd8e6352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO-based distribution tactic. The presence of multiple distinct hosts and a high number of links per host further supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nstyapi.com/resimler/files/xolugudonizalijoranalefud.pdf In PDF document text
    • http://xsteelstock.com/d/files/wivamese.pdfIn PDF document text
    • https://mar3ol.com/Files/files/52576294389.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/88762367922.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/64972181483.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/bevanitisoj.pdfIn PDF document text
    • http://standdominica.org/files/files/90130263765.pdfIn PDF document text
    • http://foxadv.net/file/85305522858.pdfIn PDF document text
    • http://cityfate.com/files/files/jagujivureruxux.pdfIn PDF document text
    • https://solturism.ro/images/file/bizewumejoridobes.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/74392773372.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/nufajekunodaja.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/pajanixoxulubadokesopo.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/guretijesujivuxivogo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/fuwepul.pdfIn PDF document text
    • http://enkepharma.com/upload/files/651043586.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/uekmehrnpnm01ah954gomahl0r/fatewinidese.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/vekifetakenazedutafin.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/faxumoj.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/91464333188.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/xexababibagapuminad.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobiwegonibogimobaxonuso.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zoganorawalaretolivi.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/72985743052.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/21523278788.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/28320079802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hack+idle+monster+tdPDF 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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10616 bytes
SHA-256: ddab148fb9ded8f75e8de6557ed70579ba1881805a8d37b784fae4fd303a19e0
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 17872 bytes
SHA-256: 480d75edeee1d9dbed6c910ad024ecc962434e19d5eebd76994e62190d426c57

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