Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91d2eed8268afe6…

MALICIOUS

PDF

83.2 KB Created: 2021-05-24 19:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1f53faf58e73c092903a0056c1c43f5c SHA-1: 5ea9f49f11b52cd11eb5f830fdd79bf26aa3de67 SHA-256: a91d2eed8268afe62a23b6b3a4ad1f7975b0aa71644938f8ca1100263feefe7c
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 URL pointing to 'jottigo.ru', which is likely used to host or redirect to a malicious payload. The document body, though heavily obfuscated, appears to contain text related to wood cutting crafts, suggesting a social engineering lure.

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/strik?utm_term=tipos+de+cortadora+de+madera+manualidades PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417534/normal_60034bdfbca88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_605d6657397f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_6017c88ecfead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_606545f9eb245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_602609ccd70f5.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/mubemutolewe/59988186699.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/61996421034.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/57807864717.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/81608340645.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/transact-_sql_formatting_standards.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/41770752882.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/92051639306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33524b5c-ea50-4fac-9a56-9cc621f5fe19/olentangy_local_school_district_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/star_wars_knights_of_the_old_republic_free_download_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/maytag_maxima_x_dryer_not_heating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38949075-b21d-4f89-964b-4f7540664fcb/painful_red_bumps_on_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8e6b44-2744-4df7-9c52-b0e4d50f887f/modelo_contrato_de_arrendamiento_de_vivienda_colombia_2020_word.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/contemplate_in_tagalog_joke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329d9cef-c982-47bd-9370-3a910c9abd58/2015_maserati_granturismo_mc_specs.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_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 5168 bytes
SHA-256: 04c8e5944ee0485b1524cf86c87bbe7353d23222a75948a00f5a9782d395d171
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 12476 bytes
SHA-256: a86cbc5a65cdd18e17550a3b52872ed700eea1fb074ec316e773a1c192412bb9

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