Malicious PDF — malware analysis report

Static analysis result for SHA-256 931ed9ba8a3548fd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 14:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e7174d8e4f95940bb2efe984a0ac586 SHA-1: 5ce084948c64fc4e7e13d52d84b376d94e03b3ee SHA-256: 931ed9ba8a3548fdc26782704bf309b91c9a4e91ce6139218fe022b2c9da1fa9
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded links, many pointing to unknown domains, suggesting a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://innotek.vn/uploads/news_file/nujedenukura.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8204bb856---lumejoxatimejuxufak.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/71098947217.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911024514.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/kiwek.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/18267295941.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/lijasimuderenivijutak.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/bugipodejefazupotejaze.pdfIn PDF document text
    • http://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/17377870416.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/woxogap.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/mirawenibemutavimuriki.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/zopuzulekenoruzozazosepot.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/7233357976.pdfIn PDF document text
    • http://millecolori.it/images/file/31616912062.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/24203767875.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/zurulibowanoraxasi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/6936321309.pdfIn PDF document text
    • http://seger.cz/userfiles/file/puxijunuto.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/16406875259.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/16459275818.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907143527.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/badufavevomen.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/fobifugorisosowofiwemuzum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+20+mobile+android+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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 17948 bytes
SHA-256: 37c32eec751ae1b2d6abb1d67310a872695a69ce67a981455d27c6bd17544710
font_02_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 10844 bytes
SHA-256: a577d3ef9031d941c870e5292c9db48b924b208b484ac03cbbee6abcafd5fd71

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