Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa9ec9d216d331a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 09:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbb8641fdfdedde6e95185d795ac4e38 SHA-1: 1246ff7e8a39613a66f0ce903fea9b0b82e152ea SHA-256: daa9ec9d216d331a93d7c274cb639a4b131772c887876df41332c8abbd3d097f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains or link farms, suggests a phishing or credential harvesting campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://keletunderground.hu/images/uploaded_pics/file/99216212424.pdf In PDF document text
    • https://matratva.in/userfiles/file/1924667974.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/rowino.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/39693763a3921cfc1f6521a01fa99943/vumutabimot.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/191101333322.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/mesaja.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/15853433954.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/lagifuneg.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/59881829650.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/89312242728.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jutuxosuda.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tukafetopenisigo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138d51e39695---rorufudowep.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/namigosu.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nejevanopugafezinuniwe.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/numezabefonolegas.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/wabigamoliwawunojufogisa.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/biwiwulepisomuk.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210917125203.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/84142729362.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/88819348207.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/zumelirus.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/78979198411.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/sewugagagotafoguwulovije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ahinsakawi+mp3+downloadPDF 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_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 10660 bytes
SHA-256: c2030e63e684b69e72c0cc5c4df1ccf267bc8a08df9a0d522bdc35a8de20fa3a
font_02_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 18832 bytes
SHA-256: fa98577b018cbab7d82eddd914144ed6acaaea921d5a2bab859d391e0629382d