Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f8fa8f96ba3d39…

MALICIOUS

PDF

89.9 KB Created: 2021-09-12 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12934fc073a2bc67247c56cb3e5af458 SHA-1: 35a4dc85ac81ef9d8444461a1e3d992e98c1d663 SHA-256: 67f8fa8f96ba3d3915639ff0eafc29ce1132490823e9500b65e77a0eba17d7b3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the detection names point towards an attempt to redirect users to malicious sites, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.masozilina.sk/ckfinder/userfiles/files/texajatekova.pdf In PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/kimedisoj.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1ee3571a---kumopafomedodaxo.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/funosebowipuwine.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911215650340.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/semonodedazikul.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/91711896058.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/nomafurirub.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/12518126979.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/fajiligilubigegaje.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/54113288162.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32830017047.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109030911386381.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/nilawepedop.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/14111004907.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/40683460429.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/bafinuximaxuzefawawude.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/67268482319.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/11868224459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=maalai+nerathu+mayakkam+watch+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 17644 bytes
SHA-256: 71715472033673366de1c2009da65077c0387aeadbc3aadf5d9a0302e709d2aa
font_02_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 18168 bytes
SHA-256: b32f5df51a9cac50b3ac3770c95ee2fa6bf310a26151688d2bcfd3e08a2e3d02
font_03_sfnt_off000140c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C9 10712 bytes
SHA-256: c79b00af0c1d3fdcd09528034ced574116d6ba2440598d3be09b8d05d44cb512

Open this report in the interactive analyzer, or submit your own file for analysis.