Malicious PDF — malware analysis report

Static analysis result for SHA-256 f655277c33e87a09…

MALICIOUS

PDF

80.9 KB Created: 2021-10-20 02:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10f60cfac94d5f3c8a4139c434f6ac93 SHA-1: d4658bea6e403fcf18ca2513fd6eac5e8931e75a SHA-256: f655277c33e87a09c16bc2b1157430a74e1e6d9ac9f981a6d475c9dcb5727c24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files on a variety of domains, many of which appear to be disposable or low-reputation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to distribute or obscure malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smartsecurity24.pl/userfiles/file/jomegilazuwapujizedoruv.pdf In PDF document text
    • http://eko-inwest.eu/upload/file/lorazomop.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/fuvotafipolasesojutisema.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/muwipugogevelugekusupe.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/24411876218.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/fibiwutinipuse.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/fozawaworibifiposajidum.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-10/15304566809.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/moduvawiboramoduwa.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/kujebun.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rudebekaxakikifapasanuner.pdfIn PDF document text
    • https://petroservice-eg.com/userfiles/file/luzofakixuzapofategaz.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/38857935610.pdfIn PDF document text
    • http://potya.com/98294479135.pdfIn PDF document text
    • https://jobtiara.com/files/files/85018408367.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/fulemepunifisegibex.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/rofiwifetedulin.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16151810b908b2---ladewiwukoguda.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/14852119827.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceec789d3d---temudavoleje.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/tipodubizedemixopive.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/8842750784.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20211005171707142.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=great+writing+2+great+paragraphs+5th+edition+pdfPDF 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_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 17728 bytes
SHA-256: aa6c9a7f9956f14bacb4253124dc797f50029eee7e90a50c9a6edfc267d36d06
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 11108 bytes
SHA-256: f0f3860d7036b5f7deb1c361768d3cec868cdfb84d418d2d6b7d8d51db4c732a

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