Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1e33b4618d56b2…

MALICIOUS

PDF

83.0 KB Created: 2021-03-23 18:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf14cca6905c657ee2497f703bcbe22 SHA-1: 199a2c0e9352a183d1fe43b4292bafab9ec1177f SHA-256: 4e1e33b4618d56b29131cc7990f1b08371ef9003ffd6c1b242934f03105b716b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the document's structure point towards a phishing attempt or a mechanism to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-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://kuzutuzo.ru/strik?utm_term=tuesday+with+morrie+aphorisms
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/sukeligopevimigeliwi.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60159eef61e8b.pdf
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fc8f22d4b5e1.pdf
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/pomegofag.pdf
    • https://cdn-cms.f-static.net/uploads/4485823/normal_60199d669b3bb.pdf
    • http://nesegejisivinu.medianewsonline.com/bungen_bruchrechnen.pdf
    • http://zofugef.mypressonline.com/88020628683.pdf
    • http://lebizifijafaxim.medianewsonline.com/fikezute.pdf
    • http://xozowilozoga.mywebcommunity.org/97471116925.pdf
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/4540490.pdf
    • http://safijejog.mygamesonline.org/brahma_kumaris_tamil_murli.pdf
    • https://cdn-cms.f-static.net/uploads/4484633/normal_60174f3aa2b6f.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/judulemu_dulekuf.pdf
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/7627920.pdf
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/3553986.pdf
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/993ec38cb700d.pdf
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/kotavisixi.pdf
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff336cbb410c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xefiposokupama.myartsonline.com/gomifanum.pdf
    • https://uploads.strikinglycdn.com/files/cb476ea5-7e8a-4d64-bc4b-7e9a73bba70e/turtle_beach_xp400_xbox_1.pdf
    • https://uploads.strikinglycdn.com/files/8e22b4ad-973d-439d-9d2c-9eef5f0fc520/bezinugoke.pdf
    • https://uploads.strikinglycdn.com/files/7cc26fe0-0f21-4d28-9a27-9e398a786723/fewovepejipojisozi.pdf
    • http://dakafatuvuguviz.atwebpages.com/how_to_pronounce_words_correctly.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_off00010731.bin
e6feb47986ee1d06ef0a2a374e51ef56385f107391dc7b3d16c18692075dbf5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 5308 bytes
font_01_sfnt_off00011927.bin
9d822a88a02623a7bcef26e3cf97db43c21cab6edf6cb499c524da95bd6f3c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 10740 bytes

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