Malicious PDF — malware analysis report

Static analysis result for SHA-256 04830548ea485699…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 23:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4591fcaf054b8dbd0f09f4262942c62a SHA-1: f98d8501700d21b3d14bd6028f1278cf4920c5b8 SHA-256: 04830548ea4856991e0b89d8312ebb6888f3b07284fa8e72498b69550b862f81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of disposable URLs, many of which are linked to a lure for downloading an Android calculator application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://eastoncn.housemember.com/uploads/files/wenex.pdf In PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/33499961124.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///14342039184.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/31766093747.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/barebegizokukumosesosirew.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/rejitufetobemiku.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/8037395123.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/18407635422.pdfIn PDF document text
    • http://www.og2c.com/images/file/tukugasarikogoxedupazib.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/90512906428.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109031021533554.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/88225093543.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/kibagotiji.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/mapejefif.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/63763317045.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35130893110.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/77864443095.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/xurowegoxuwukujopaxi.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/56979040626.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/24503126831.pdfIn PDF document text
    • https://teamcode.net/upload/files/lugafis.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/11363834475.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/vukevagadokosaniv.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/80043071054.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/tosarepilul.pdfIn PDF document text
    • https://31app.com/userfiles/file/xepilidemonorokib.pdfIn PDF document text
    • http://email-database.info/userfiles/file/gogamepufakila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+calculator+for+android+phonePDF 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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 14372 bytes
SHA-256: 93f97a79efd52d72635b108a655041861c22699e449a63ba53fb19b6101344a8
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 10736 bytes
SHA-256: e1387f99bd916ceaa776a9234dbdaa176d4988fbb768a41b139ffff8d79fe3d0
font_02_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1