Malicious PDF — malware analysis report

Static analysis result for SHA-256 086cd08fd2b74444…

MALICIOUS

PDF

69.2 KB Created: 2021-04-28 15:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4120cd476918a1ee75fa0a17a5292afe SHA-1: f9eeb57d32320ef7310a68dad6a7810383fa38cc SHA-256: 086cd08fd2b7444496e168b29067a2e64c0d8987f272c0623f959ee2d8e4ab4c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is highlighted as a redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for phishing or scamming. The presence of embedded URLs and the nature of the heuristics suggest a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pelibifir.ru/strik?utm_term=historia+universal+de+la+infamia+an%25C3%25A1lisis PDF link annotation
    • https://cdn.sqhk.co/nobixapo/aqgpvl6/79812415819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff3afd1234fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492588/normal_5ff166beacf40.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/GigherG/dance_music_80s_disco_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_60225761a5b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6046da89df4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_6038b82c4f0a1.pdfIn PDF document text
    • https://sepefawepuvikex.weebly.com/uploads/1/3/5/3/135384525/digunotu-wuvazat.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/DC3Esjd/8650235878.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/yejO7jc/disulet.pdfIn PDF document text
    • https://daseguvemorog.weebly.com/uploads/1/3/4/3/134357845/3604971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b07d260-e119-4c9e-8702-a3752cde5695/hp_12c_platinum_financial_calculator_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617d2234-964d-42c5-8aee-a1dd024558d1/56238175174.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_74ab460571544d40a7c0be08bbba3dd2.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_dea417613bfc4d8a9bf6caef081b4821.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/68493959959.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/alice_miller_prisoners_of_childhood.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/craftsman_10_inch_radial_arm_saw_price.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_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 5308 bytes
SHA-256: 735e9d1cf04aa6878c3e83e5364aebf34cd61688d750b9924aaebd363d549eb6
font_01_sfnt_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 10784 bytes
SHA-256: 119c7c7487fa093678d720e0c9794fe5ab573cf29dbfa9cbff3aa575372cc376

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