Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa978d53fbe0c6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 00:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 163390ce00dd2ebd8a134f5c1a8cf3ab SHA-1: 096f13c91784647043e28ae8ecfbc5de9e8aeb88 SHA-256: d8fa978d53fbe0c62327a7a03e761a819da749ebed0dfa57e5a5aa95e31b0e64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. The primary goal appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=3d+modelling+app+premium+mod+apk PDF link annotation
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/31757c3994fa6a58eabf6450a4bf1e25/16313696454.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/ponek.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b5e465f83cb38ce9e64ce2b2af63f297/togifuwobapuzixorilat.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/sisife.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/tixakipesopimokemegap.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/59988866964.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/vupizoromexunedetukujez.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/3927486427.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/zotediwon.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pavatijexirilu.pdfIn PDF document text
    • https://luminex.pl/upload/file/laxutivoteniwikopelevixi.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/6283930257.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/dakorapu.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/neluto.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/pazatamoso.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/98327921348.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090204220254.pdfIn PDF document text
    • http://portableandcool.com/files/files/95916326004.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/takokerowebokimoxawisabal.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/tanezekama.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/jilux.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/80776334523.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/86746604763.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_off0000b5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AB 10736 bytes
SHA-256: d7f805fec0193c6b10feafed6b1b5327004807d8426e707dcd13709379d5d316
font_01_sfnt_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 19560 bytes
SHA-256: aaea072c6fbb9b965d555c76fb8bff774e36fad9e4dd2f7012591409026f4555
font_02_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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