Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f91f056a180ea…

MALICIOUS

PDF

80.4 KB Created: 2021-02-20 20:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ac6682c78c01f67c0caf6f50487719b0 SHA-1: 7be8697dc24947f666ade983e994bfdcf404993c SHA-256: 311f91f056a180eacd743bdfb88dc1786a0f787892ad06a673106f144759510c
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'jottigo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to watch settings, aligning with the malicious URL's query parameters.

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://jottigo.ru/123?utm_term=how+to+change+time+on+casio+g+shock+5445 PDF link annotation
    • http://airned.ru/343727116616srsx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_6030030426f50.pdfIn PDF document text
    • http://thrivewebs.com/sapijipaluuioog.pdfIn PDF document text
    • http://tk-pobeda.site/sunken_pyramid_guideumq1i.pdfIn PDF document text
    • http://goldstein.berlin/houghton_mifflin_science_grade_5_study_guideu4mkb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe434195e3e6.pdfIn PDF document text
    • http://faceit.su/povudoduvuwovekuzizi756sb.pdfIn PDF document text
    • http://tranquils.space/poopity_scoop_memeamw2v.pdfIn PDF document text
    • http://zarepawofeli.22web.org/anglo_assamese_dictionary_app_for_android.pdfIn PDF document text
    • http://mibasigomebul.iblogger.org/zusupaxikotulegasuku.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/rizezobabub/a_que_movimiento_literario_pertenece_la_obra_el_burlador_de_sevilla.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/virubifos.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/nimafomanebemelobexaluse.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/ocr_a_level_geography_examiners_report_2018.pdfIn PDF document text
    • http://runesufosufej.rf.gd/apcolite_premium_emulsion_shade_card.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/3582245181.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/fagosoz.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/wikun.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_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 5416 bytes
SHA-256: a5f20ce5138c0c3e98b0496683bc4cd4fcb76cf758b9df67fda56a1b94508298
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 10512 bytes
SHA-256: 162085cebbdf7d7d95f7654c45ac294003c67571577cfe6392a03de1c89d7e93

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