Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdde79aa7b974d40…

MALICIOUS

PDF

83.6 KB Created: 2021-03-01 22:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c2b599285d8d56a52a8c5bc6edba78f SHA-1: 76203af45fa9cc4eac5ad567981ab1d8492c0184 SHA-256: fdde79aa7b974d40f2ee8f0d284622f71ea4fc6241d05cfffca22d3e203c4cb0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with one prominent URL leading to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Deloitte pl/sql interview questions'. No scripts were extracted, but the presence of multiple disposable domains and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/aws?utm_term=deloitte+pl%252Fsql+interview+questions+for+experienced
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fc62fa82086a.pdf
    • http://zemesod.getenjoyment.net/finders_keepers_stephen_king_synopsis.pdf
    • http://ruwakus.22web.org/lkg_worksheets_free.pdf
    • https://cdn.sqhk.co/fiseguvugele/Zjbiegg/xoxovafuwupokewavan.pdf
    • http://garanibukumom.scienceontheweb.net/feverurawota.pdf
    • https://static.s123-cdn-static.com/uploads/4377410/normal_5fccb02dce154.pdf
    • http://ekzo-fruit.ru/tadab81g4h.pdf
    • https://cdn-cms.f-static.net/uploads/4486037/normal_601ae657debf0.pdf
    • https://cdn.sqhk.co/ragejeli/hcjjZja/fortnite_creative_escape_grandma_s_house_2.pdf
    • http://detonic-ordina.website/what_is_service_request_in_itiljx0z6.pdf
    • http://mebets.xyz/magic_bullet_theory_media_examples17d35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fekofenuxekit.rf.gd/pejodivoti.pdf
    • http://nixomirorubu.myartsonline.com/life_history_of_david_maraga.pdf
    • http://tofujuwo.onlinewebshop.net/fender_mustang_floor_used.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb58.bin
40bbf9175a871f2e8a2f8ecd9bc398a2603bdb07a3a9b363f4710ed5502616b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 5200 bytes
font_01_sfnt_off00010d36.bin
23404ce9c26504700725dcc758228884c3dc357c91ad08e8e1c221b69bef8f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 11040 bytes
font_02_sfnt_off000132ad.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 4324 bytes

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