Malicious PDF — malware analysis report

Static analysis result for SHA-256 4545a13a50ac16a3…

MALICIOUS

PDF

93.1 KB Created: 2021-02-25 06:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 92b8827d63dcd159699c69a7b86219b9 SHA-1: e8a53e96e61c83f0b4734cd10b7cf86c1d4cef3b SHA-256: 4545a13a50ac16a31eebfbc18d8baf46ab15229bab0e59728de61946e56de9e9
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'free printable world map'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=free+printable+world+map+without+countries+labeled In PDF document text
    • http://carbackseat.site/taxonoma_de_bloom_verbos_objetivos_generales_y_especficos0qjln.pdfIn PDF document text
    • http://migerov.xyz/eleanor_of_aquitaine_civ_6_france_guiden6l62.pdfIn PDF document text
    • http://jefofonem.iblogger.org/tibigejuma.pdfIn PDF document text
    • http://osthondroz.com/genki_answer_key_first_editionaf4to.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/sar_tech_3_study_guidefrojq.pdfIn PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/kubenagamufawofave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gatinilub.epizy.com/66669804401.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/foxatamapexovox.pdfIn PDF document text
    • http://jipokogave.epizy.com/zogijigusugepotuser.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/riwalaxilozuxuno.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/the_bluest_eye_google.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/rapiporib.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/14350375828.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/bolilurosekasepisod.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/ludovico_einaudi_sheet_music_fly.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/12798830940.pdfIn PDF document text
    • http://pugasixowofizij.epizy.com/free_chess_games_for_windows_10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 5384 bytes
SHA-256: 7a6685d97ecc86b4223e04b523c0a7cbfb388df430723d203322e9464eb209cf
font_01_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 10596 bytes
SHA-256: 170a6af6dc86ae5fc5b8a95dd108a5043713df61ae106d8c7c5a2c3bf98c3e2c
font_02_sfnt_off00015873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15873 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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