Malicious PDF — malware analysis report

Static analysis result for SHA-256 912ac1142a3fc32c…

MALICIOUS

PDF

79.8 KB Created: 2021-03-18 13:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2007c12e71cb2a2b59d04cc48006c3e7 SHA-1: 2894b9cf43ca57fc333df9ee77334ee091d13c1a SHA-256: 912ac1142a3fc32c8d4fdb0527b784ee1e15a1208f94ab9519f9f6d0f43ad6a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm or phishing attempt. The document body, though heavily obfuscated, suggests a pretext of a contract cancellation letter. The presence of external URIs points towards the document's role in directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=letter+of+cancellation+of+contract+pdf PDF link annotation
    • http://lizoguxumugef.mywebcommunity.org/public_speaking_tips_for_students.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/information_security_risk_assessment_toolkit.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/43784767984.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_5dfff9028b714c4b80d676ac7745c452.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/78455832022.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/misurene.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/blumenlied_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/veridewolorufivase.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/kms_activator_windows_10_kuyhaa.pdfIn PDF document text
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_b150c7ca9d944202b285dbe34acca55c.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_5283509108074461a5212b963bb2c9f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/jeviradurob.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/82179372924.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/57108373634.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/31543404222.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_7ea8ee0615e84a0db6ef5c7eeda5c146.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/tera_chumma_me_chyawanprash_video_song.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_7ebf3cf7d225422181577f6aea2fc7d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/xefidadazopanajeb.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/manual_all_wheel_drive_cars_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_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 4912 bytes
SHA-256: 3f7dd8e785a0ffef9a92ae4163ee4a893bd436f9e6d0ae13f9b83620b2ac12c0
font_01_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 10628 bytes
SHA-256: 0ff7f327a23c801aa7a36deea747c7d0bfea08f6c6636fbda275be50a127e68f

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