Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4ef9967dfe6004…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 02:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6a06e4ce8679afbe75a8a498f2a590 SHA-1: 7f6ff7530d9148da54ebc990f7ed95a393449df4 SHA-256: 7d4ef9967dfe6004b7192fdfb18343c7ab63b344ab9f8917ade25f03b943ba2a
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://resalured.ru/wix?keyword=hoover+hard+floor+cleaner+manual', which is likely used for phishing or to serve a secondary payload. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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
  • 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://resalured.ru/wix?keyword=hoover+hard+floor+cleaner+manual
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/713200.pdf
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/5e78eb.pdf
    • http://zogometemo.sportsontheweb.net/mcdonalds_allergen_menu.pdf
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/3150969d58a.pdf
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/relafugiken.pdf
    • https://visameme.weebly.com/uploads/1/3/1/6/131636817/buzixeloto.pdf
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/6993440.pdf
    • https://fidexirubopuzer.weebly.com/uploads/1/3/2/8/132815065/vaxuvarirodewu_lenoleluxeruda_fimito_selitetakupi.pdf
    • http://fukuzowi.sportsontheweb.net/83708319409.pdf
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/9207930.pdf
    • https://zamuwute.weebly.com/uploads/1/3/0/9/130969683/tirowudatut.pdf
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/tunemanodajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_91fd9e0125dd4fd08071646ee1aded2b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d739d97-a016-4c98-8103-af2b9f44fd5d/the_magic_barrel_symbolism.pdf
    • https://uploads.strikinglycdn.com/files/2176ba7d-e0f7-41ce-927d-ab821b59b6f8/dixukezaminanav.pdf
    • http://lagazirixul.rf.gd/laboratory_assistant_book.pdf
    • http://rapabilalame.rf.gd/pijugakibujimuxununakifa.pdf
    • https://uploads.strikinglycdn.com/files/cb7382a0-f803-44ee-a6ea-2ef7dc849939/gotejikunikarawof.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_34a0a00e4261406d8fd5e9741711f27a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a419dca9-ab0e-4279-b3c1-3e1fe08fccb0/3963061186.pdf
    • https://uploads.strikinglycdn.com/files/84531f64-b667-47c6-9796-7255a9a4e51e/49089718328.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_0899d78de29f47f3beedb25d5d716912.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_fd1059bfcc124f36883f0cd048238153.pdf?index=true
    • 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_off0000f74d.bin
d958e6b72c88c819e5c08c961f5645fa82da9f02f0843b638b43b1e6576921ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 5104 bytes
font_01_sfnt_off00010887.bin
6955d6528813cde84a3173fbed45f6f6cd1feb5311849662884a94ae6802bcd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 10888 bytes

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