Malicious PDF — malware analysis report

Static analysis result for SHA-256 e013d33ef5830c7b…

MALICIOUS

PDF

70.7 KB Created: 2021-01-24 15:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a4bdd6a1f5e0139b05017538761fda88 SHA-1: f11c20ebf9917918ce654fe70305487f6cc7b431 SHA-256: e013d33ef5830c7b7a4a570ab02f902b3c1aaf8de8ed6bb6c36ce2b4628c87f3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the structure suggests it could be used to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wb?keyword=rome%20total%20war%202%20strategy%20battle PDF link annotation
    • http://brumbum2.xyz/indoor_basketball_arcade_game_australiaa738i.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/EOgjjgO/85120588610.pdfIn PDF document text
    • https://palogipotutaz.weebly.com/uploads/1/3/2/8/132814365/suziwawamiguwop.pdfIn PDF document text
    • https://pebajubidu.weebly.com/uploads/1/3/1/3/131383648/jivata-jizamepol-munafalo-vufeveri.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/OYligfJ/nails_2000_framingham_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fd8cd002c5d0.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/Youuaij/57166686954.pdfIn PDF document text
    • http://mexicotop3.xyz/nevinaturi05imi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454304/normal_60071d97e20ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd1bc04e6038.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/zgggiiW/fox_mountain_bike_helmets_large.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/gcHhejc/xegure.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/pegitezuzuvozoroliv.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/PMRjcUp/auction_app_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 5480 bytes
SHA-256: 73d76ca96eadb5847f7eda1e5b18e2077e1085a8a91b837a25fe2f1d81872dd2
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 11036 bytes
SHA-256: ef289ff1b152141b7739c009ad5cf19a7f55e8e26bd74d2a59de5f4cd699b015

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