Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f45bd41335bf93…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 12:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22ba2e93adf4359e27aaba72f1950293 SHA-1: 84095aa2189a90804ab5f9c72fe148bfa9779d70 SHA-256: 52f45bd41335bf935342d01e804539b9c47c2312cb5c3919911343bd188d4bdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mehmetrasimmutlu.com/icerik/file/wujez.pdf In PDF document text
    • http://kcpsystem.com/userData/board/file/jafodukunuzani.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091807013170554.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/bonagojeteguwoxiwajijen.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/43144221453.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210917075418-fosububi.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/rixebonuwodiroku.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/8051979342.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/runofugewewaliv.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/22430303329.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/fugadarupuxepinalimegabe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ffa7be7a---90662908073.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/kevegatazibepegupatofir.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/3139382885.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/11002479685.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/34386575942.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pepumoniwowotefanosuwode.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/kilalovudak.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/rarixosiditavifawujowem.pdfIn PDF document text
    • http://maksimetall.ru/files/60610894762.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/2109060532097274897o7869wsfdyh.pdfIn PDF document text
    • http://guowangcable.com/d/files/tapixigomezideritosi.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/938001355.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132134363f68---18038114631.pdfIn PDF document text
    • https://anjingliar.com/contents/files/gemuwitopabitegimug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+things+to+have+in+your+basePDF 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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 17200 bytes
SHA-256: e5648e6bf6fca203a8669e5206acf0eb88b1a1f9677c7d9dd576f15428aaebd1
font_01_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10980 bytes
SHA-256: 576cc00d31814847847cf475c6d72afd728d6ea13a831dcf757c760cd2438fdc
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1