Malicious PDF — malware analysis report

Static analysis result for SHA-256 0baf463aa86c8d0d…

MALICIOUS

PDF

69.7 KB Created: 2021-02-24 22:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 11695d7e92fdd8e2eb3aaf60abd63bb4 SHA-1: 2da8c38f19b736bbad7b56ae03e5f3fce7018f7e SHA-256: 0baf463aa86c8d0d295812e37325080e9e20eba7380a7b42d92fa5545557feda
252 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting an SEO link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the document body and embedded URLs suggest a phishing or SEO spam campaign designed to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=what%20is%20sweat%20equity In PDF document text
    • https://sonoredepi.weebly.com/uploads/1/3/0/9/130969061/9474888.pdfIn PDF document text
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/seguvanunebod-lemek-rewagevuv.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/e679608b2.pdfIn PDF document text
    • http://fitness1.space/sejawani3pacj.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/datitanomuv.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/fazor.pdfIn PDF document text
    • http://numulul.mygamesonline.org/wukakekemuxabomo.pdfIn PDF document text
    • http://kulokozataxat.22web.org/39219714204.pdfIn PDF document text
    • http://nutapobo.iblogger.org/again_your_lie_in_april_piano_sheet.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/fikuvine/xikojekusetofowi.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/7719717911.pdfIn PDF document text
    • http://latilofu.rf.gd/statistical_methods_in_medical_research.pdfIn PDF document text
    • http://lafojagifod.epizy.com/cadillacs_and_dinosaurs_apkpure.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/43313968899.pdfIn PDF document text
    • http://zuputes.atwebpages.com/12852722152.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/walt_disney_world_parks_calendar_2021.pdfIn PDF document text
    • http://lelesajik.epizy.com/maternity_leave_format_for_doctor.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_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 4980 bytes
SHA-256: 8b6de97479413ba12dc7dfe61a47a132f1f2f6a51ae1bc5b4a75f303e607df9a
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 10596 bytes
SHA-256: 090b6760d39d9e5502f8c4c03a03f8292ab35822cea5d178527fb198af6b45d7

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