Malicious PDF — malware analysis report

Static analysis result for SHA-256 973bf2236d4e1288…

MALICIOUS

PDF

100.0 KB Created: 2021-03-29 02:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bb39440a7c7ff6f274ff4c06d7e881b5 SHA-1: b21cc9c6350ce07905a5ec9c641ebdaa18877a92 SHA-256: 973bf2236d4e12885aa278f3841c59018277d1993cafdc51e2096f4bfaaca00c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware installation. The presence of numerous external URLs, many hosted on disposable domains, further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the lure suggest potential for embedded JavaScript or exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bologen.ru/award?keyword=adobe+pdf+reader+apk+for+windows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486987/normal_603af5215127c.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/8942948.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/along_came_polly_rebuke_freezd1zm.pdfIn PDF document text
    • http://gopexilif.22web.org/89708687955.pdfIn PDF document text
    • http://ig-copyrightviolation.com/89665273686thopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5fd0f4eb685a0.pdfIn PDF document text
    • http://bionatur.space/jersey_fatf_mutual_evaluation_reportk70h2.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/pewivadofadizeleta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_600005f858137.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/xolegixetonazux-levaki-sokupujizanozok-kepevakagepuwo.pdfIn PDF document text
    • http://sevotapapi.22web.org/how_do_you_reverse_a_maytag_bravos_xl_dryer_door.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5fdb58dc6f0b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_604663351549f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5ff460f48b108.pdfIn PDF document text
    • http://openplafond.xyz/queen_size_platform_bed_basectamq.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/1138973.pdfIn PDF document text
    • http://xenifizonuk.22web.org/61546738158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_60022359177fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/mumewoxap.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/ham_iv_rotator_parts.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 18272 bytes
SHA-256: be4d94dbdcffe7c5fcda509bb90dd42c14de0026e9348c198eb8cdfeb90ea050
font_01_sfnt_off0001344f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344F 5288 bytes
SHA-256: 251238e29566eb19efe467114c3f4d85f0f74d4d66ed909fb46d408d77384a6d
font_02_sfnt_off0001466b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 11180 bytes
SHA-256: eaa04e9319629540586eb80a8ef7566de6958adacb876d0418476c996b8c8382
font_03_sfnt_off00016ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCD 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15