Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbd1406a25f19e7…

MALICIOUS

PDF

80.1 KB Created: 2021-03-26 00:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bfcc144aadd7d046d07384cef568db5 SHA-1: d73fe776aef563f5ccade15cd14327393cba0a52 SHA-256: 5dbd1406a25f19e733634d920ac473139e0bc6d73de55bc77f25e2b175fb32a6
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=basic+calligraphy+fonts+pdf
    • https://cdn.sqhk.co/lojadisexudo/Mjgihao/just_smash_it_rage_rooms_orange_park_fl.pdf
    • https://cdn.sqhk.co/sizebadit/EVwhakd/age_of_history_2_apk_free_download.pdf
    • https://cdn.sqhk.co/fujonexa/hb7Miet/pencil_box_for_kids.pdf
    • http://vipadobotisituz.mygamesonline.org/meaning_of_social_development.pdf
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/bebufezasose-vimepoma-kakiwasofitizi-tukuxifujoxodu.pdf
    • https://cdn.sqhk.co/forinabam/hhguAWC/danesuligef.pdf
    • https://cdn.sqhk.co/bupabumo/ijhgijQ/48558748503.pdf
    • https://namikefazexu.weebly.com/uploads/1/3/1/6/131606603/3007034.pdf
    • https://cdn.sqhk.co/berazanoga/3Hijtjf/51982808437.pdf
    • http://rosutob.getenjoyment.net/goximomawa.pdf
    • https://lujoduxatodovaw.weebly.com/uploads/1/3/2/3/132302833/1407881.pdf
    • https://cdn.sqhk.co/zusisoko/jgevsZI/jisezese.pdf
    • https://cdn.sqhk.co/fedovusig/gBiiSL1/diboxizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/ancient_egypt_eye_symbol_meaning.pdf
    • http://vekamodadon.onlinewebshop.net/26923505027.pdf
    • https://s3.amazonaws.com/sinadi/92608506214.pdf
    • https://s3.amazonaws.com/jolituzoji/29379376007.pdf
    • http://wukevivetarapu.myartsonline.com/car_buyers_guide.pdf
    • https://s3.amazonaws.com/vidadaviwal/spotify_premium_hack_android.pdf
    • https://s3.amazonaws.com/dogazisuze/converse_plataforma_bota_el_corte_ingles.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2a.bin
e1ebfe8977cb612eb5583907b795a1a2e314527c99854a7f048bc86a1da3f69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 5568 bytes
font_01_sfnt_off00010e1b.bin
49888ab99029a728003e5280cfe3fcececf6d206e5ad2ab44aeb0a468dd8c8db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 11000 bytes

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