Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4937dcbb05cd64…

MALICIOUS

PDF

87.7 KB Created: 2021-03-21 00:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2128834e0c70ef04becd7ab27d9a7681 SHA-1: 3b27f88da5a6e47a32d57db49ecce76bb517d4c8 SHA-256: ad4937dcbb05cd64a119b30a0a73d597e59a6d0a365ace9f5320c1821f258ba0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution, as suggested by the lure for 'Hay day apk unlimited coins and diamonds download'. No scripts were extracted, but the PDF structure itself is indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=hay+day+apk+unlimited+coins+and+diamonds+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419849/normal_5ff91be1d9a6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5ffcfa37ae370.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/jhin0gc/lovugigefiwiluxedusasurib.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/hgtHjiD/kirudoxegumibuzejolavod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fe009265d89a.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/Mjdpp5C/48301050527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fe66a2c2906d.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/Sbiizhf/big_hunter_game_download_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_603729e1b5b89.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/ihUhcnR/57333116234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375080/normal_6000079cf2204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_601f0f5096e74.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/Phhhfoa/diamonds_of_sierra_leone_remix_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fdc88f55243d.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/jonora/vocabulary_worksheets_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/sustainable_agriculture_agrimoon.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_2b61e300869e44e191802eb6a92ea5ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijari/27644499552.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_2f87aea90e69497b9813ca55c61dcb8f.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_c538bb515a8344cb82505e3757fcbd87.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_5913e36333a34fbfb0fcef8c4df5bec8.pdf?index=trueIn 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_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 5344 bytes
SHA-256: 41e0f44c6f8ead77f66c4f56a923acdcbd266195992700ca6d941a524d7b75c3
font_01_sfnt_off00012c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 10764 bytes
SHA-256: e813b1d86864fcd0dfecf92fc093e7c7316a0ea689457406807db613288187aa