Malicious PDF — malware analysis report

Static analysis result for SHA-256 16617fa162f33f65…

MALICIOUS

PDF

75.8 KB Created: 2021-02-27 21:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f0b8cd93353f5e51d7e83747e2ca84e8 SHA-1: b86d2e365ccde825fdabc3d1a91fa4be77aa0d33 SHA-256: 16617fa162f33f659b4bd1c87ff48dad48ae560e3efe542bd810c3bcc009e88d
184 Risk Score

Malware Insights

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

This PDF file contains multiple links to known malicious redirectors and disposable hosting sites, indicating a phishing or malware distribution attempt. The heuristic firings, including 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS', strongly suggest malicious intent. The document body, though partially obfuscated, contains text that appears to be a lure, and the presence of embedded URLs further supports the attack pattern.

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://dafemum.ru/123?utm_term=you+will+be+leaving+soon In PDF document text
    • http://krokoboko6.xyz/amoxicillin_mechanism_of_action2u2ai.pdfIn PDF document text
    • https://jususisizeka.weebly.com/uploads/1/3/4/2/134266965/busidevaresizavurek.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/d96449b.pdfIn PDF document text
    • http://axecheat7.xyz/52997561774lbc3c.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/1847004.pdfIn PDF document text
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/garexabutotofap-zesidejajivit-vosekowamebewi-witinag.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/wodizunofobulexwbtz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5fc959171e71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fe67664d062a.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/how_do_i_reset_my_grandfather_clock.pdfIn PDF document text
    • http://photoforce.ru/89763780213f69vo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_600316b39a1d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5ffc8f6129f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_6020b6910aa2d.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/667d78ef5d.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/vitox.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/sorogamat/28697845086.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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 5008 bytes
SHA-256: 4937f728e409dbfcd7ca11f657fa159df7f28ec2af75929acb9e05d67f08e2dc
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11196 bytes
SHA-256: 5920d92352fe5bb9c16fd5d36b5c35cbf0f8cbcad2e45641223ba0e8028afb41

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