Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5094cdea9407230…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 01:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e62c03e513506d0461b4aa86228932e SHA-1: 9cddef083695a9172c199f24942466e139fa3492 SHA-256: d5094cdea94072307710819f6badbf978255ef67f92cc971cd6401fd4d6c2da5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading unwanted software or visiting malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=download+flashlight+on+my+phone PDF link annotation
    • http://doremimarlikinsaat.com/userfiles/file/woranewazufofozopibugefa.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/wozutuzuwufemimeretofer.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/poxusasaxekajupep.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/41596983103.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/wokizazo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/muzudo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/28609875376.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-12/210912233859094150guoa1h8mgt73.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/fexakifesawik.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/mebobuzokenusa.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210910_180046.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/89182364741.pdfIn PDF document text
    • http://trovas.com/userimages/45507276962.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907215336093.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/84266171062.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/71370913604.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/13620212821.pdfIn PDF document text
    • http://aquatherm-graz.at/files/nivijipetogugeseratat.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbd2884ac0---42649383571.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb94929fac---41607819208.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/zisebarowawes.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/kijujonaxipofugu.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/996802006.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/pejoduxesejibovawaw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1858d8296a3a01f1d9071c22588797a0/medunosuvevazupepaguba.pdfIn PDF document text
    • http://sjhtractor.com/d/files/wedezamusomevakap.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_off0000b4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AD 11044 bytes
SHA-256: 5733798418b1db7397deab3c2d38295cdf457a9c9087cd4d315f97a8f79cb0a2
font_01_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 16512 bytes
SHA-256: 79add1955621063fde6f8f5cdb608fa0fe8c155fc9351b1f4fb683e03e0024f8
font_02_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1