Malicious PDF — malware analysis report

Static analysis result for SHA-256 919a1f7968527920…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 09:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81398a6a43bdc26b3104ffaa2c3a935f SHA-1: a002df0b214caa425edc41e24b4a052ea7627e82 SHA-256: 919a1f7968527920b6a33bf1df5455f935c24435e2141c1a3c46d491a90eb051
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the PDF as a link farm on disposable hosting, reinforcing the phishing/malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studioguagnoni.it/userfiles/files/48284987565.pdf In PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/zevalezobudugazetupudo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea269ee41.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/47563004581.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/63204553018.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/tofunojadevokufakaniju.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/jiwofebaninarelitigi.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/dibimusudotewiginumofetuw.pdfIn PDF document text
    • http://geasit.it/userfiles/files/zaridajuxinivabimukituxu.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/buzezivakuzavilanoz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd70df157---60555233584.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/sexuwakur.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/33763399448.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/zuponoxi.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20293359675.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/82174932083.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/84766373604.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/31261200177.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/14410164462.pdfIn PDF document text
    • https://people11people.gr/uploads/File/50928433799.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/vezig.pdfIn PDF document text
    • http://varvshistoriska.com/file/tebogefudevawul.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/zapididem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=screen+size+on+note+10+plusPDF 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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 18280 bytes
SHA-256: a47a1c47aa3f32b6ec1921d3a307086bd6c66d516ca9906a7af8d9401b5cac47
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 10612 bytes
SHA-256: d55baabafc79d5544b87a8f7628597b0c01ee476baa9c3e99b603538044492fa
font_02_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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