Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5350105ef851364…

MALICIOUS

PDF

72.0 KB Created: 2021-05-03 15:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 986ab3618749d43b267241d25280b8c9 SHA-1: 8c1ae3276abe1b1a3e37e79ed7b5058916517fae SHA-256: b5350105ef851364b71de3a2643e37694b309e70c2871ea99cdceeeab4ec03cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'Sanyo tv codes for ge universal remote', aiming to trick users into clicking malicious links.

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
  • 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://pelibifir.ru/strik?utm_term=sanyo+tv+codes+for+ge+universal+remote PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376087/normal_5ff9e82174465.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jjd3ieA/us_navy_military_ranks_in_order.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/543b18abf.pdfIn PDF document text
    • http://vas-rem.ru/44828005027efkwi.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/d100601.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/M1hfjim/electric_meter_units_to_kwh_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/igdIhah/seviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456663/normal_605a774b8ea6a.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/fNi43cQ/candy_jump_unblocked.pdfIn PDF document text
    • http://vanlit.ru/como_cargar_saldo_gratis_claro_argentinaozziv.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/2UFGYgd/atlas_anatomie_humaine_netter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365613/normal_5fce6a71843de.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/gKie5Ru/80718829388.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/loranoduzuja/how_to_make_a_bar_graph_in_excel_using_data.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/80838222809.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/bikokuduvozufulo.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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 5604 bytes
SHA-256: 2b530b4fdff1fec71670ebaa1c1bff80f95aa107eefa7c68bbf6faf0032c0b82
font_01_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 10228 bytes
SHA-256: 1c914933c3a4cbbdfe75a3a08bb3510e0c989d4ea57e449316a851783efd2133

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