Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe35d516fb80a5b1…

MALICIOUS

PDF

71.2 KB Created: 2021-02-20 07:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: df70542c1fb6166446116d5d16337c7f SHA-1: d715bde2cef510da4930734ec77b5e0888dc1c30 SHA-256: fe35d516fb80a5b1f8ed37aba72036e668033915aeba50fe45717cdc0ba0f14a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards a phishing attack designed to redirect users to malicious sites.

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 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://crophysi.ru/strik?utm_term=when+did+the+bowflex+xtreme+2+come+out In PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/gulidipemutebig.pdfIn PDF document text
    • http://pycnidwzxc.info/cashnoe_mercury_online2kmq4.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/qjf4heF/piano_tiles_2_apk.pdfIn PDF document text
    • http://hookup153.site/26292360115s8517.pdfIn PDF document text
    • https://nitesefoxon.weebly.com/uploads/1/3/1/4/131453907/fuvulis-ragamakugana-dujoruvejor-jomilakapix.pdfIn PDF document text
    • http://originalhallyu.com/28916025221u85km.pdfIn PDF document text
    • http://puxegosabax.22web.org/demographic_dividend_pakistan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5ffa372647d56.pdfIn PDF document text
    • https://cdn.sqhk.co/wudarivat/gjigjGc/detention_officer_salary_los_angeles.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/2741550.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/gudukupir/56899631898.pdfIn PDF document text
    • http://molobexe.rf.gd/char_broil_2_burner_infrared_grill_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/ohongkar_bangla_movie_2017.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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 5316 bytes
SHA-256: 3d164b066489691f7dba94a710cbdcd9573e4ca1ca68ee3459e7bd265388947d
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 11144 bytes
SHA-256: a18c7e3b37ff46cefefbf512a8bee1ef2afcff84c4f0ad5e3f196540fbdf67d8

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