Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad840fd48ca22ac5…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 00:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43a8f8a3de87acdb3e37f3791c785cff SHA-1: 49b2cdd6ca21b7218eb93d0ad6409e7a8dd5146a SHA-256: ad840fd48ca22ac592380991e7dcfe0be31fa4809f3591a65a986a3d16b5d799
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=gpu+turbo+boost+apk PDF link annotation
    • https://vico-domrep.com/ckfinder/userfiles/files/32540972299.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/57188646075.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xukubarosilezufepenebo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/73098729454.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/gabesowekaviwoxazosulobu.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/11533333008.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/99580213717.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/vewudakawufinal.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/2889024263.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/suxutevamejexabolabo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/5104293056.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/pilalulagatigobakugoganob.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/wugukajokudibugezovefox.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/65442013802.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/jinumutajalaxowu.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/ranebageruzixoz.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/92225287643.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fuwafozopezakenuxoj.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/ledalebalebejaf.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/41519156.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/sasenupumiradajap.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/44818541872.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/gozumosufufin.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/wotixexeter.pdfIn PDF document text
    • 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_off0000af42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 15968 bytes
SHA-256: 5a4abe763962449e1694898285eec0badd50305cad2e7a64b38e8df6712877b6
font_02_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 10244 bytes
SHA-256: b398ea0fa8c382d5045392e181b71fc34f64d9b5d9c22a4c1adcc26622e3f098

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