Malicious PDF — malware analysis report

Static analysis result for SHA-256 147ed1e2e6f6e006…

MALICIOUS

PDF

71.8 KB Created: 2021-02-15 03:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 814fa8851c5784b7a8fe0d47faec9f83 SHA-1: 057dfcba2e5356c29124856096a36b975144506e SHA-256: 147ed1e2e6f6e006f6eafa7548726b8fae7daa86500b9d00aef3557229a36ada
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on link farms and redirect to potentially malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'angles in polygons worksheet pdf', aiming to trick users into clicking the embedded links.

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
  • 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/aws?utm_term=angles+in+polygons+worksheet+pdf In PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/mutilenusasa.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/3264198.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/regax.pdfIn PDF document text
    • https://jodavetofa.weebly.com/uploads/1/3/1/4/131438562/a30929e539.pdfIn PDF document text
    • https://dafuzimobolu.weebly.com/uploads/1/3/4/4/134498283/7804883.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/xejigida.pdfIn PDF document text
    • http://testersairf.xyz/mitisoprsty9.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/418224.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/palelunilodo.pdfIn PDF document text
    • http://palitra-cveta.ru/winning_eleven_7_indir9loks.pdfIn PDF document text
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/319920.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/sebaju_jakefuz.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/gadumagabusodel/anbe_sivam_movie_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/understandable_statistics_9th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/cladogram_practice_sheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/86135466311.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_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 5340 bytes
SHA-256: 8049cf4e3510d9fe68cd98d6344f674293f66ec2513533cad533cc4b738371d1
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10896 bytes
SHA-256: eb487d46ffe3328afa52e2c87755c868bab151a6aa2d8643e3f324d01cfd64e1

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