Malicious PDF — malware analysis report

Static analysis result for SHA-256 943027bdb1c9e294…

MALICIOUS

PDF

71.4 KB Created: 2020-12-03 23:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3405bb6ee9fddaa04b4e498b56d3c9c SHA-1: 969f6bd56ea1b1647753c31857c73228100231f6 SHA-256: 943027bdb1c9e294e239f8cd85f8b20ce531f2cccee7a5007353d25078c7e0e2
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'biology prefixes and suffixes answers', likely intended to trick users into visiting the malicious URL for a fake resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://trafffi.ru/strik?utm_term=biology+prefixes+and+suffixes+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427284/normal_5f9f060545e25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/73325311553.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/chaita_video_mp4.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2991b1452f90b7ff011dd/t/5fc66fbb1972c46e3c7bf61a/1606840253095/fosubozon.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/gapumexizamuwuxada.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/shirley_valentine_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/79416924055.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/gogebo.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/hyrule_warriors_definitive_edition_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/21._2_adverb_clauses_practice_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/castelnuovo_tedesco_fantasia_op_145.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/abhimanyudu_telugu_full_movie_free_2018.pdfIn 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 5520 bytes
SHA-256: d9beec6cba6f1f7c0086f1c65d114f839627f547fe3fa684b262487692850168
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10436 bytes
SHA-256: b27d404def6a551255e77caf4728f52e9d8c28cfe46ee179e806c67325d0269b

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