Malicious PDF — malware analysis report

Static analysis result for SHA-256 43061719bd669933…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 14:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a97c8ec94d59acfe0153150b879084b SHA-1: 3c40dfe5898f24f86f68b3063ca5a76b697c0514 SHA-256: 43061719bd669933eaa49e05e1185d60d721867bbac56fc740fdda485f1f2ce8
166 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing or connecting with a remote support tool. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely involving the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://inwebjor.ru/uplcv?utm_term=how+to+mirror+android+phone+to+android+box PDF link annotation
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/703034294d56fac355c6bd3fd5950d66/dazukodikonunole.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/toriwidexozotarawajojo.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/80593690553.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rojopazekisabebapumej.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/44530134176.pdfIn PDF document text
    • https://jurad.eu/files/file/posor.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/netidamemibetadomori.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gamikuvofimeragafikur.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/49uovsabdhr1i8ihjlk2p6cjth/27948030669.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/jujitirazipexewekoli.pdfIn PDF document text
    • http://seamacros.com/upload/file/kupoxenowe.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/12712108417.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/60890683314.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091311441473499.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/kolobagudavipisosim.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sowixidalepafumil.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/32896756750.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/67653085199.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/tevopivosoruto.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/fumav.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/morotevobebabupukiwumozo.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/75883499181.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/seterabebukekizo.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/lujud.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 17508 bytes
SHA-256: 77584d204ac108dae2e3dca79006ccaf9da040e53035e9095dfb6504569b1564
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10760 bytes
SHA-256: 9645fb080e49f6a029ec1d3ffd91481b2bf7aebcb5946cacb3630fd8be613020
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1