Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcc8faf71e8e242…

MALICIOUS

PDF

176.9 KB Created: 2021-03-22 01:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2a8edfb087823e4ebcfe8cdd286f7bf SHA-1: 74add5bf29fe3359692e2a10e33af597e187ec81 SHA-256: adcc8faf71e8e242babb0d08e6c0b595ab9a2e10e49f23eddf2ae5ba6a51eb01
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a phishing or content redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 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 http://hristogrigorov.com/reading_plus_answers_level_j_marvel_man18tlb.pdf In PDF document text
    • https://cdn.sqhk.co/puxobaku/fvyXhj1/edit_text_in_preview.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_6018384fe58f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_60385cec297e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_5ff3ff10dcad8.pdfIn PDF document text
    • https://cdn.sqhk.co/jobasalem/djiNshg/zovogesu.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/jg0QSuN/galaxy_buds_plus_warranty_check.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/Wieha2W/nidinememoxumajawunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_5fca30e9c4733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444630/normal_6005d46708c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_603b4df91299b.pdfIn PDF document text
    • http://artrosil.xyz/36794841842n6m7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_603673ec17530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6050df249d6f9.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/JibOejb/t_mobile_senior_plans_3_lines.pdfIn PDF document text
    • http://nutristrike-shop.ru/handbook_of_pharmaceutical_manufacturing_formulationsaxe1z.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/WGhidiz/wewomanepanikurewexadil.pdfIn PDF document text
    • http://byt-upak.ru/enciclopedia_de_la_sexualidad_oceanoznbh0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fe44803227ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=bolt%20action%20sniper%20rifle%20fortnite%20damagePDF link annotation
    • https://uploads.strikinglycdn.com/files/f69c29b0-d990-4086-9619-6adc9e107718/vepulamibor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f345d4-c9e1-483b-8711-feb028ca03c1/craftsman_gt6000_for_sale.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000257fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257FE 2952 bytes
SHA-256: 18f3dad90f0b8a749557125039a501166b605b51d41492c5c2dfd7e147c8bf53
font_01_sfnt_off0002628d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2628D 5524 bytes
SHA-256: 983c3ac58254409dcd1fc531cbdca7ea40c9aa4280eaf42a35f6f385a794c654
font_02_sfnt_off00027546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27546 11856 bytes
SHA-256: 8c1ed6d77182a2b4eab7058c067e58e383b8c684ec47eeb480c286f5a52c859b
font_03_sfnt_off00029d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D91 16516 bytes
SHA-256: 6ef4ef753a53509aebbc90c89f91b7342b32e96a078fc55527c0e74d46ad9b52