Malicious PDF — malware analysis report

Static analysis result for SHA-256 905ecf82a2c0dd03…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 10:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 18c82a894773c19056513bb8cbfe2ce9 SHA-1: c6d455f07100216fc9bb901d9636b1b4b9308b71 SHA-256: 905ecf82a2c0dd03ab4afe6412c793131c924f98b972572cd6deb0589d9b7403
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to other PDF files on distinct domains, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly suggest a malicious intent, likely to distribute phishing content or further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bwc.lt/i/ripurakigev.pdf In PDF document text
    • http://precisao.net/files/files/47539175727.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/lamisifajukitela.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/25839421943.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202110030713025693.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/32349415301.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/levokuzejofusewopup.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/76285081077.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/27620122244.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210921_201259.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/63623222089.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614789730af3b.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/24890344407.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/68571020350.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/xanogubimadaxuga.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/33311476555.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/jezirulitumal.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/ferikiwiz.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pibekovajafefet.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/14928149618.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///63820898887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=quotation+marks+after+question+markPDF 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_off0000af79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 10728 bytes
SHA-256: 86e0d7062d8ed4e4a27ee87bc85c92b73db80eb69869624bc70ce859812ecda8
font_02_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 16124 bytes
SHA-256: 9f31c36b90eb9d629129252bc12d6be22c245423c43184e0c4d448b44fad34cd

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