Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db5d078cf81e44a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 23:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0d11e1fd9dd2a1886e1c635d0d83097 SHA-1: 3f6f2cbacc6d1fe9c17e62cdc0f4c4690ac8e212 SHA-256: 7db5d078cf81e44a319039238f79340f7d1fa0be95de4ebcfebac50e4e23ee43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://vividconcept.in/userfiles/file/xumuzetarili.pdf In PDF document text
    • http://antichigelsi.it/userfiles/files/laxatazafinosilanevodise.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/kepubuwefor.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091015070997.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/23981214057.pdfIn PDF document text
    • http://kahasat.cz/data/file/kevipuvemo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/50463925518.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/netogejesojaniz.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/83928974922.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/wetajaxisezeb.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xadedixubekowegupisa.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/15461862347.pdfIn PDF document text
    • http://atrsara.ir/resource/files/27047726532.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613387265acb2---pugibebemolimaj.pdfIn PDF document text
    • http://hbaoge.com/upload/files/96990968838.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/selatubebirofukelufegite.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/nijasejotixumuvujoret.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/vanigogomugemanowezeture.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/14511140076.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/71251507021.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/35537312973.pdfIn PDF document text
    • https://afayl.com/userfiles/file/winolosolegokutesigexelaw.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/10132284315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bypass+xfinity+wifi+login+androidPDF 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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 10896 bytes
SHA-256: e092e402aefbae558e58e9ae213c37ff0eae8fbff0a26c3a8fd4f4c26dc77382
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 17260 bytes
SHA-256: c81830e97c41d037b4e06d1c208bca742251b476b470efe49be3b9a993d9d9dd
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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