Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fafab57f1436ce…

MALICIOUS

PDF

105.4 KB Created: 2021-03-23 13:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 68fce08fb68647f1f75346a639a21911 SHA-1: 50e1ec0387f6edd83ec8c7e9ba1622d7260e5c07 SHA-256: 31fafab57f1436ce7c5462a1f4e36526613412a1ccd4f2637a4947bf8ff3dc3d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=brandon+sanderson+books+reading+order PDF link annotation
    • http://memaviwebepa.22web.org/nepidupuwuvokivida.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/jukoxisojow/how_to_update_my_android_box_2019.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_3dd62d4a1d5247e6a7c715c78f83493f.pdf?index=trueIn PDF document text
    • http://keguwaburafokul.epizy.com/challan_copy_in_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/winobotalug.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/bose_earphones_apple_vs_android.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/34171017679.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/busonid_50_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/43170578823.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/reduction_by_formic_acid.pdfIn PDF document text
    • http://wetizizokixo.epizy.com/adobe_flash_player_for_mobile_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/65230409016.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/how_to_reset_tp-link_av500.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/rakumapasifikodafide.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/guzojujodudugilu.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/xifotodizogodezixe.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/21517789287.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/new_bollywood_movie_in_2019_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/1681647709.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_0d82d85d99104e5fbb438cf785c23d89.pdf?index=trueIn 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_off00015d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3E 5212 bytes
SHA-256: f87eea249e9b0c852abc9ee37dcd666fde12782983e7b6c34293b231b943111c
font_01_sfnt_off00016f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F09 12040 bytes
SHA-256: ed46d9271ddf33e006961c963626347c21cb09352429fe135258c89bb76ece2b

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