Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a01b78e67b870e…

MALICIOUS

PDF

75.0 KB Created: 2021-01-09 18:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 91adc362387d433fcd2e62e29414adac SHA-1: c1b42cccb70279ae191046d84f453f51b0b6e85b SHA-256: 71a01b78e67b870e8988831877575240828ca3b79ad7b429730bbff29e16e4dd
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 URI pointing to a suspicious domain, trafftec.ru. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains keywords related to 'free math worksheets', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=free+math+worksheets+printable+1st+grade PDF link annotation
    • https://cdn.sqhk.co/zewuxumaro/fhhgfhf/super_mario_3d_world_map_theme.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/9684754.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/Tgchdhc/83180425991.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/e15054582.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/duzuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/926c93d6-8e27-4965-8fad-0770ba11e262/goshen_local_schools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4402d4-780a-4556-9b78-647aaf3ae9b8/53220609525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/679bfdd0-a9c3-4fea-b361-e724fd9e1aff/11191707415.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/kaspar_prince_of_cats_guided_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/wuvananola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5af489-ea92-425b-8be3-33436daf91b8/words_with_gods.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/xovimuxikoligoziputo.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/hellboy_2_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/bennett_mechanical_comprehension_test.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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 5676 bytes
SHA-256: 62b6634cc014ca395ee63fe80d36bbb68fe385dd79763cdf81e3f81099a0988a
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10916 bytes
SHA-256: d8dc6044614970c095f28e751d279cc3f7445c46568375d781478020dc154a4f