Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2555102dc94b54…

MALICIOUS

PDF

83.9 KB Created: 2021-10-13 15:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d52587833ab1796d436cf14f94a9f61c SHA-1: 5fb0b2cb441f586151ff2515a45d1c3a574f594f SHA-256: 0e2555102dc94b54575a0c5db9ed4d40d94fc51b1884808d563eceaa1f720823
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to distribute phishing content or malware. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://congtydaihai.com/upload/files/1896841040.pdf In PDF document text
    • http://akademibt.com/resimler/files/betimokixaneleb.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146dab812bc9---lupaponamojedokibesexu.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/supitutuxawa.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xowawodezubemo.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/rogidolajimebaxamoluruxo.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/15530746753.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/77535883408.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/tawed.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/sgdau5vhuc15rolt8ipfgfv9v2/92296997885.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/6873545801.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/53504763510.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xonon.pdfIn PDF document text
    • http://mextro.de/upload/files/91811275893.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/24997293356.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/13632151943.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-10-7/20211007172704579242.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dadawokorufebax.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/jifozerefuxubi.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/bumakanupivosabagarufalu.pdfIn PDF document text
    • http://prompol.com/media/file/pozavemadojateb.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/90492338507.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/92141448873.pdfIn PDF document text
    • https://halkum.rs/files/2482849132.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=what+does+ssn+stand+forPDF 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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 19988 bytes
SHA-256: ebe65111001927050a7d8a642b85804499cd2f02343a29431bf271c2e8927b8a
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 10304 bytes
SHA-256: dfc3239f1f5539be8f141de1efc2da1d15d6d03d8a0aa1fd41b45c3aec52cdc8