Malicious PDF — malware analysis report

Static analysis result for SHA-256 b764cc6f32d5ceec…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 02:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 965d7fccf84fdf6425dabae02b558bc8 SHA-1: 4f0c1956fc5304b17136bca1594d2831e32f259f SHA-256: b764cc6f32d5ceec1a2572bde61b6aa17d92e32173949745fdf9fc5282991173
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, several of which point to known redirector infrastructure or disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text fragments that may be intended to lure victims.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=big+law+firms+in+nj In PDF document text
    • http://lbaranaydin.com/19708398118uujkj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_60090a4235f8a.pdfIn PDF document text
    • http://italia-doc.fun/que_es_la_composicion_de_una_foto2ki1p.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/xanize.pdfIn PDF document text
    • http://apelsins.space/anti_litter_poster_templatensz5v.pdfIn PDF document text
    • http://airet.space/zaxisepezitarinuruv92x3.pdfIn PDF document text
    • https://penaveligatoka.weebly.com/uploads/1/3/4/3/134314422/tuzojepodotinafura.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/gonoliwefotilat.pdfIn PDF document text
    • http://copyrightsupporteds.com/78400456981dyg0t.pdfIn PDF document text
    • http://berkeciftci.net/452721289187eukm.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/27c4557c78fef.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/86310109040g5hqy.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/63375819234.pdfIn PDF document text
    • https://mewabasotu.weebly.com/uploads/1/3/5/3/135312567/bazusatavuwepol.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/jodabiladezot/889421778.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/35160462464.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_much_is_a_box_of_romeo_and_juliet_cigars.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_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 5304 bytes
SHA-256: 7eb59e011789b0c788416f21cd423b77f2dfc790e83d3266a84d34c52be1b894
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 10416 bytes
SHA-256: fd5d8795e89a3890aed524a5c015a32b3bf8e87bb0a08960d0badb3552fb065f

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