Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49604708e004e8a…

MALICIOUS

PDF

73.0 KB Created: 2021-03-05 08:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0fd68810abe0e891c45fe72e4963fcfb SHA-1: e5f7eb1dc6ddd4ef73ad315f644a8bf472a3019f SHA-256: b49604708e004e8a20c19db1ca484b5115a2d09c8d07d51f7468e6fa532f94ed
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to malicious content. The ML classifier output of 0.999745 further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=dexter+middle+school+principal PDF link annotation
    • http://zedukibawubige.22web.org/poter.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/giriridepegirumabuduj.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/no_fear_shakespeare_romeo_and_juliet_act_2_scene_1.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/oUjbjhp/rigafinunetarigodejixewo.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/43479122664.pdfIn PDF document text
    • http://jinokawobusuzi.iblogger.org/logical_connectors_worksheet_grade_7.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/pawunirevuzunujapamotivas.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/beats_studio_4_price.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/hbChahg/uncivilized_crossword_clue_nyt.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/e5Dfrgf/qr_barcode_scanner_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_0139f10f095e4bde8d93c289b9b85df1.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_1ef2bab1e4eb4b3f91394f503200bfe3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddda1bc3-4463-4645-9499-d8c7e08e4e3f/how_much_does_an_engineer_with_a_masters_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403c4a5a-1eb2-4a75-8cee-44b1615140a5/leduvibuxikivenekonexasix.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_06d88117bc52430290410ded08b9f5ac.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 5380 bytes
SHA-256: 420ef16d5adcdca82a6520a3e20e47c3e67c7150eb2e1004bc120c8de9d004e3
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10432 bytes
SHA-256: f33953ae780c507106be25ca29b81d1ca827ce40b2fbcd7e23e2166d358e2d95

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