Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20b6997843c1e95…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 14:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a21af0010f5ad98aafe17612303b6f1c SHA-1: 534545b0c03d1c9b1c0f4936687d3320c32f16f3 SHA-256: d20b6997843c1e954cfe9c6c7f5d99915f652e3258edafca0e305eab292e07a7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains multiple embedded URIs, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://biometria.pl/photos_fck/file/30304112309.pdf In PDF document text
    • http://wakabaeducation.com/userfiles/file/xufetutejurakepunimasoror.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/vuvowajexegenawopigovu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/65122494489.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/11762482345.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/79036278784.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/nafalakisaw.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/rusikibalitem.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/gasefawovapotopuletetut.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/gezivigokapo.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/53721619458.pdfIn PDF document text
    • http://steinemann-ag.ru/tugut.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/povidajobajapedenebufo.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/18217379541.pdfPDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d125b801cc---towivexezodotukeduj.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132d54db34cc---84004655810.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbc796a2e---45135305934.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/wominivule.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/34357299856.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/74524006574.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/95240942740.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/gabolozamojimerakuterur.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jubinedov.pdfIn PDF document text
    • https://fratellifurloni.it/file/wasafakuzuxutavefiromojal.pdfIn PDF document text
    • http://dominant.name/userfiles/file/20429649554.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/sexijajarujasopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=text+over+photo+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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 18136 bytes
SHA-256: abeb08b057d6c0b7a34229af30be4ff2c8b8f48961e993340adc86d2d5de2ecd
font_02_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 10160 bytes
SHA-256: b52082a1d5ed5a0641682cfac82981296dd8b3c340570a9c11e5d45a8ba5f4a1