Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d2a15b737280e1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 23:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 406ceeb3e629725129142deeadb5bfb1 SHA-1: ea74f7d0fc2a48b7a5b90f476955ca46008201ac SHA-256: 18d2a15b737280e11703321068db4e82a329b42b9820977c8dde1c6ffedf9d12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs and a visual download button lure, suggesting an attempt to trick the user into downloading further malicious content. The presence of multiple disposable hosting links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=yes+tube+downloader+apk PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1fa13106ff9488eb1b0f5c31ae789219/93854495046.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/89413164073.pdfIn PDF document text
    • https://kueapem.com/contents/files/12725239358.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/855390652.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/56606771557.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20459598785.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/25391654117.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631846008.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/nipojonitabokaliv.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/3831642835.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/moverikuzajugejibajife.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/dozofiluxugepugineponov.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/99388387111.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/77664824931.pdfIn PDF document text
    • http://logicamail.it/draft/media/fefiwupix.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/togugaraxapetiwif.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/najuzeg.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/77720486550.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/25559153358.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/23891315295.pdfIn PDF document text
    • https://phunhai.net/upload/files/luvup.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe4818c31---76854891329.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/xujavomomoxe.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/zelipapalaw.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/kusivisovenugebu.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/xirumujebeka.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_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 17736 bytes
SHA-256: 53309b8a7323406438861be1a572074e4fbde686afbe8669857d81e10413c76c
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 10692 bytes
SHA-256: 56684adda5912f6d9f2b7760cf5e132fa46e78ab82a2f3b92ff4d50be0b0622e