Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4cd970fec1f181…

MALICIOUS

PDF

86.3 KB Created: 2021-05-29 05:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb444ecc650bf26c6cf9dcca8eeaad76 SHA-1: cb573fb5b57a381eeb8b4922e572c90a850d00e0 SHA-256: bd4cd970fec1f1818406c42abe156eb42875c724f955cb3a5f88f52018943cc9
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically a 'Browser extension / update installation lure'. It contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'shell shocker cheats' in the UTM term further indicates a malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to trick users into downloading and executing further payloads, likely via a malicious browser extension or update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://golowaki.ru/strik?utm_term=shell+shocker+cheats PDF link annotation
    • https://wopamogifit.weebly.com/uploads/1/3/4/3/134341426/vizapujunom-zawilaza-jedulemerawu-mibolupogove.pdfIn PDF document text
    • https://xelemurefitarag.weebly.com/uploads/1/3/4/6/134601467/kolerij_tefaruk_bivevukawapexa.pdfIn PDF document text
    • https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/2312054.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/304786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_5fe653fb35f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383452/normal_5fedbe9cd1786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_606aea6462f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_600ff5392df9f.pdfIn PDF document text
    • https://finuredapek.weebly.com/uploads/1/3/4/3/134352460/minotaxikefex-buwefijeji-viduxakifusaji-venene.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366316/normal_60afec17741a1.pdfIn PDF document text
    • https://sogekapi.weebly.com/uploads/1/3/4/8/134891770/195305fef.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/27a327a8859034d.pdfIn PDF document text
    • https://futixaxez.weebly.com/uploads/1/3/4/5/134516919/tujojinalogirun_nuvoligola_tarosofamadog_mesivezizom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_6010aba9179b5.pdfIn PDF document text
    • https://bodadesoka.weebly.com/uploads/1/3/4/2/134234706/7166260.pdfIn PDF document text
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/8637197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/424ebafd-8450-42b6-ba69-68818e9f6b2c/xemew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ded0fe-ad16-431c-a53d-ec3c0c50c1e7/how_to_compost_food_waste_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21543e12-8208-40b3-a3c9-c4baa404112d/evaluation_histoire_cm2_seconde_guerre_mondiale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4fa565-8a2e-440f-9089-e18adb3abc3d/sueo_de_una_noche_de_verano_teatro_tepeyac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ec8fae-827f-467e-9c23-01de29d3c206/29318785508.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_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 5052 bytes
SHA-256: 1241df1e8c6d4e027f45bcb1e40fdd67bbb0b0c5c78c09449592466c74a79cd8
font_01_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 12696 bytes
SHA-256: 7bc6d829329c17cf69055db242f28f00a030950468e03c525c16e50596435e3c

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