Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb93de371b4bf989…

MALICIOUS

PDF

80.6 KB Created: 2021-05-12 22:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f1ae8424c5ae041fc0410c5de750b2a8 SHA-1: 9c4a4529532f494285795b7ad36cc85d529f9a0a SHA-256: fb93de371b4bf9897231c542495c3f3ef7c4db152a9dd9f5b7f97e077cdf5a45
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=enrique%2527s+journey+summary+chapter+6 PDF link annotation
    • https://cdn.sqhk.co/muwanije/NQihcgh/belesagemajasiboboro.pdfIn PDF document text
    • http://micrometerdigital.xyz/9291862477607jrl.pdfIn PDF document text
    • http://megatorg.ru/sesozurumotebk04pu.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/gdughjw/talking_mermaid_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxosoler/lieijjg/jigevajum.pdfIn PDF document text
    • http://blancop.xyz/pevepathuxj4.pdfIn PDF document text
    • http://realwockyc.info/97197264775ta97o.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/kexawim.pdfIn PDF document text
    • http://shoop-ff.ru/purolaridefinesekosinuts5cwr.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/hb7gjia/secret_hero_empires_and_puzzles.pdfIn PDF document text
    • http://storezone.info/yamaha_digital_mixing_console_ls9-32_manual25i1y.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/aswrhgx/hornblower_cruises_san_francisco_fleet_week.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/daxewavut_wunolirokot_zerixazag.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/7200183.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/japokovon.pdfIn PDF document text
    • https://wabalunizuwa.weebly.com/uploads/1/3/4/6/134643533/576c28a21fb.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/7323098.pdfIn PDF document text
    • http://fresh-ita.space/ubee_dvw3201b_wifi_password0k7oc.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/2966b96133e24.pdfIn PDF document text
    • http://arfeshome.com/xuwapuz4rue.pdfIn PDF document text
    • http://netewe9.xyz/how_to_draw_a_puppy_dog_pawg4305.pdfIn PDF document text
    • http://afracheat9.xyz/99370376666rhvnw.pdfIn PDF document text
    • http://tonagruz.ru/vaxasalijomaguwosadodusitwpie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 5472 bytes
SHA-256: cc04664da0697354de7c368a70b3f9c68201bd0ed7842f10ae632732e4f81873
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 10776 bytes
SHA-256: daa805ab6dee0093c7afdbb4ef12a120473e08c75cc616f4d531a5081f2af7fe
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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