Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe0a89df5b73880…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 05:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c7fc2ed6fa59abde1a570502d27b174 SHA-1: f4893d5af397dccc4e1657a11cffa09dfbed268d SHA-256: 3fe0a89df5b738804d177a413f4c278a82201af3fb1d80539d2abdbac26df41d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of many unknown URLs points towards a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://boras-sjuharad.boj.se/uploads/userfiles/files/jelolusakuvojurizexikafo.pdf In PDF document text
    • http://seghers.kr/data/editor/file/41379573061379dac46571.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/82815521807.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/52748268670.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/24830124587.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/42375992860.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5be5fb90---rekubufug.pdfIn PDF document text
    • http://stl-hk.net/userfiles/87810675528.pdfIn PDF document text
    • http://contua.org/userfiles/file/62324807219.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/tukuzuzakumujizene.pdfIn PDF document text
    • http://donghotam.com/luutru/files/5621347093.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021202522147.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/16772631383.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/58756519389.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xesoguduvalaxexijobus.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/puzujotivazopusipuboxet.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/91653481106.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/22876857004.pdfIn PDF document text
    • http://usateatop.com/_upload/files/90353340486.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446339ba26---pafotesavajamalireleto.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/4676932544.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vorojajasapasulek.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210910053307.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/14954364524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+video+with+link+apkPDF 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 18208 bytes
SHA-256: e74e21902363540302f830961afb09ce21fe266b683f1c88c87178f278d57b0c
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 10468 bytes
SHA-256: 9050f71aa07e19f5d3a83eb1e9aec125cb69ccf5234de35dcc7ac5802fa7075b

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