Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfff7fbbc51a5518…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 05:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acf7c9df6185ae4d3e23524e6046a996 SHA-1: 2fce3672784fd67e6ef800593dd7833824a3da56 SHA-256: dfff7fbbc51a55189ff5b12f29fecb2c78409b8ea88c8dd6437a84f7b0b6f916
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic firing suggests the document is designed as a link farm, likely to redirect users to malicious sites. Numerous unknown URLs were extracted, supporting this finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://salonorganica.ru/upload/files/25581096911.pdf In PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/nofusavarivujujovajete.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/vazulomigigolaxar.pdfIn PDF document text
    • https://adikmanis.com/contents/files/xedubufemilefu.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///govipewizovi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xilawuzeruvofenabeje.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2cbe53c0---munirotanoferasiva.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/27013512367.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161360f348e3db---duvumup.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/votubulawenelukixowozudel.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fafik.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/78715866151.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/37809294682.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/14878591960.pdfIn PDF document text
    • https://tsolisp.com/files/file/fegavi.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/61778354531.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210902043634.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909072752_075nil.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/79070931494.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139057434286---7872104260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pink+keyboard+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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 17240 bytes
SHA-256: 98c25a033e8d2eef1a87cc6cdacbc8a7c11c8c44c844a1a4242240b6aac41831
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10420 bytes
SHA-256: 2a2e92a67f8cb6de254b8e2fe0bcdda6eee23946542e6fda0d795984ad98768a

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