Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5043b851405538…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 15:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35be99e41ec4bcf836f9e99858125510 SHA-1: 5192ad6051fc66b71c022798c6ca4998dfc3f995 SHA-256: 4f5043b851405538b4481ce17a8fe97383f3100f0310755fb8c33395136089c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a phishing or malware distribution campaign. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=pusang+apo+version+13 PDF link annotation
    • https://eurochen.com/UpFiles/WebEditorFiles/file/88119031494.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210916032553_03175v.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9a137314---48475351097.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/foguposakon.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/kazawofinafafafututubuv.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/72105320695.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/woxujuf.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/bukozepugumebojenozax.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/dulafuveza.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/9691727161.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/22500010612.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/rusilu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139688e42ec3---32262520602.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/21427364009.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/xalutofadazuvupitulife.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/25904293038.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xepowipovavarobu.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/3144160707.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/79178251332.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/91617475651.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 10676 bytes
SHA-256: 06bc1a3bba8e6bdc0ece6c869b937f960cffdb01ae99d6527299171c4760952b
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 17516 bytes
SHA-256: 5ccb9512c4057f4a85765939ef09fc718713730273bd531e917596e8dd263f5f
font_02_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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