Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71209df9e733fad…

MALICIOUS

PDF

78.1 KB Created: 2021-09-24 06:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3339e0ffc7d29c838f07bf2367bd37b7 SHA-1: 84bf2758702ddf7eb6be3281dada7a8e4382a9a1 SHA-256: b71209df9e733fadbb846ebd98f941300dbad97202f080a3f7effd232a5480c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that redirect to a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting for multiple PDF files, reinforcing the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=sat+math+level+1+practice+test+pdf+with+answers PDF link annotation
    • http://daotaonhaccong.com/uploads/userfiles/file/28176374003.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/nijunimamawojow.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/poxafofobit.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/65809013023.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pflj15gj6ibqib8qvscptep5mk/44126105865.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/38889617242.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/dokowebeposiseb.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/watodorivavonivebomimawe.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/78926834600.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/39352092569.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vawekesavivujiki.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/61092215652.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/79764433757.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/75361187680.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/17373066565.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/jubudewomomumamebagivudir.pdfIn PDF document text
    • http://industra.sk/userfiles/file/mubotelijudovemapetevav.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/53319789646.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/samiridovufopatujizomu.pdfIn PDF document text
    • http://artio.pl/files/files/78997441842.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/sezisuwewunavororomogu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f8129942f---98833631772.pdfIn PDF document text
    • 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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 15976 bytes
SHA-256: 9c034f3778145abdebda0208dd0b9c0a967bda7944ad5420ddcb07f05b616769
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 11044 bytes
SHA-256: cff884f529041283975238abe0932c28336f4b0f9b9532425c4c4e40963c8db3
font_02_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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