Malicious PDF — malware analysis report

Static analysis result for SHA-256 d270e663cce877ca…

MALICIOUS

PDF

75.3 KB Created: 2021-02-24 13:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6caa1d56f7ae2ccb1878d3647f0e5c47 SHA-1: 09af83fe64c39e54e3572f00b693dc00d65ce963 SHA-256: d270e663cce877ca228dcc897b1c76afa29005a3b3503ad77c5d655d069eaa64
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=samsung+galaxy+on7+prime+price+in+pakistan+whatmobile PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5ff1f063ea7f7.pdfIn PDF document text
    • http://cparta.moscow/grandia_guidejhijw.pdfIn PDF document text
    • http://esclub.info/incident_report_for_tardiness83ich.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/icuhfz8/learn_html_css_and_javascript.pdfIn PDF document text
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/146549.pdfIn PDF document text
    • http://teachost.com/58150905414vp9v3.pdfIn PDF document text
    • http://construt.site/theoretical_yield_and_limiting_reagents_worksheet_chemistry.about.com8wryw.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegorarev/hbbfgjU/33419320375.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/hJOagcs/red_passion_flower_care_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fe8f54c965f0.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/jpiiRjf/cosmic_meaning_in_bengali.pdfIn PDF document text
    • http://wordsideget.top/xovojusixiturepazabortb17w.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/V8ghBii/gizinevobobimov.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/lopadivupudexa/46977706886.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/dibobipunu.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/borderlands_3_ps4_trophy_guide.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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 5996 bytes
SHA-256: 814d787deb4adf9d16155261901a61ff4303660087e32ad14b003feb9f45a184
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10880 bytes
SHA-256: 8064065a950a842f67b62548641a100d0f956061c2efaf96826626655adb2776

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