Malicious PDF — malware analysis report

Static analysis result for SHA-256 777445e2a30b6be2…

MALICIOUS

PDF

85.7 KB Created: 2021-10-19 12:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cfe14d49ab0b0d42039430e68c0289c7 SHA-1: 8a6e1e7db843b3a7e6b94e77b618fd61e4e9390f SHA-256: 777445e2a30b6be24959b68584108bffcc82b48b5eea228d53aef627a64efc8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=finding+limits+algebraically+worksheet+pdf PDF link annotation
    • https://nichebearing.leaddeehub.com/userfiles/files/girumapapagitaneni.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/jafubumisorelusububodu.pdfIn PDF document text
    • https://mamalight.org/business_school/uploads/file/wozitumidufawagilapafuxo.pdfIn PDF document text
    • https://fond.ru/userfiles/file/53598182787.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/gudogipoxuliz.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/6833914900.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7e7c1cf0210a9f062325db27e16c035a/zugezaguwavopufenuvetuz.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/3356274787.pdfIn PDF document text
    • https://n-tlg.com/files/file/suvaluj.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/lewunepaxupe.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/10534610450.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fobusozenupegisakanogekes.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zitifiluzewijos.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/sajomipupi.pdfIn PDF document text
    • http://a-pluset.com/userfiles/vewabisefenasegizuvo.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/99758225575.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/favedomevarazegi.pdfIn PDF document text
    • http://riviera.az/userfiles/file/34352088147.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/limugubupolijek.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/nukoxirowewukebafitizu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/vexaxi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/jelozuzurepivevarib.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/80187715529.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/lupavonuni.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/xaguwibejulutek.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/titafopudumu.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_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 18484 bytes
SHA-256: 3b63d47450994ac292dc01471e35aca9da087be94d0c514796dd57f25fc87c13
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 11476 bytes
SHA-256: 702e4cf7f3295c93d39ab2d918b8ed931953b85751449b6c2e7de5fcb5c86bb0