Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8581ffab63c778…

MALICIOUS

PDF

81.0 KB Created: 2021-02-24 19:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa78b3b562e7f14500a79619df5fe00d SHA-1: 6ea246389ff6654aca5a65696337a604fdd965d5 SHA-256: cc8581ffab63c7785a8f8ad3e6cea001867a3aef45db41c45b2323c72e8479a9
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are hosted on disposable domains or redirectors, indicating a link farm or SEO spam campaign. The presence of a critical heuristic firing for a malicious redirector link and ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The document body, though heavily obfuscated, contains keywords related to 'Roblox admin panel pastebin', suggesting a lure for potentially malicious content.

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
  • 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.
  • 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/wix?keyword=roblox+admin+panel+pastebin In PDF document text
    • https://cdn.sqhk.co/ramejolir/mEfjhgg/wagufegiwabarusirad.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/hGiihaR/37150024150.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/fgghUih/download_slendrina_the_school_mod_nullzerep.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/50b6a643d.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/dhbjijf/dental_assistant_salary_per_hour_california.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/uMGWygf/mabimexa.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/id55JUe/3408489242.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/3471102.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/82fa7fc657.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/7536328.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/libepow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejukiwipe.rf.gd/zozixagu.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/cumulative_effects_theory_mass_media.pdfIn PDF document text
    • http://tununik.epizy.com/autodesk_inventor_viewer_2013_free.pdfIn PDF document text
    • http://monebepebozetos.epizy.com/6812892428.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/non_chronological_report_for_year_3.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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 5224 bytes
SHA-256: 548d98fc37f7d4b96702b1c9f6a0a761e34e15e73c6861c6335e40bf81161f3f
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 17348 bytes
SHA-256: 2921b3fd34374e842d5c8d248c940012e0070b80480acadb75538e05bfeddcca

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