Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dd27586b00ab27…

MALICIOUS

PDF

77.0 KB Created: 2021-02-23 17:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b977ff3888f9303ed20179dc7a9d3e10 SHA-1: 1df7653823aad57ed2d450d6ebd2d228d8864582 SHA-256: 34dd27586b00ab275f68cf58a2c109e33d65807c9e67c4f096b12c30cb8f2fed
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=punctuation+paragraph+worksheets+for+grade+6+with+answers In PDF document text
    • http://timelessdecorum.com/80992487733mo1eb.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/Lgghmhd/real_steel_movie_opening_song.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/diaig8z/guardians_of_ancora_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/ehdg8i8/sanatorium_meaning_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_601038879daaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ff1c1198b553.pdfIn PDF document text
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/borojukiw_xebupitujugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5fde5ec1cb1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/hihaijC/fadukaxuda.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/A6hgqji/meme_soundboard_wav.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/gjIUhgV/nigolivitekoxewexapuzikos.pdfIn PDF document text
    • http://hamsterbig.com/pixel_station_iosv81k3.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/haNjagh/85747952835.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/f67da.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/cssZKKT/dufexevekoforigoturawob.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/dAejFgj/faily_brakes_mod_apk_latest_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 5696 bytes
SHA-256: 3f4c169f0cfda3a84f280f0920b92422be1f65130fadbc862ce0ce4f72f45d41
font_01_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10960 bytes
SHA-256: 34eca4b5a20004f3afdcd2bbc81ee24d03ba672b546f1389e8442e91be721396

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