Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48cb53f795d4d70…

MALICIOUS

PDF

75.3 KB Created: 2021-03-05 09:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 54eb6c2a319988b83e91055b18cbe9a2 SHA-1: 9048dbb8e398d2a47a67967cfeeb286740ef729b SHA-256: a48cb53f795d4d700e68c196a13afb601bf448f45031def8cf88d5fc9e5b4d90
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

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://midufefew.ru/strik?utm_term=frank+buschmann+pattern+oriented+software+architecture+pdf PDF link annotation
    • http://xigegojaliku.iblogger.org/raxasiliwusabore.pdfIn PDF document text
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/vipavorunamadewomi.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/9cc9683be8.pdfIn PDF document text
    • https://sowekunozo.weebly.com/uploads/1/3/5/3/135321923/xizedozokiniwapula.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/9d98b.pdfIn PDF document text
    • http://pojopazutapo.iblogger.org/38240363017.pdfIn PDF document text
    • https://butadagawonor.weebly.com/uploads/1/3/1/0/131070306/c6fe3097328a5.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/zerejibixupav/burak_yeter_tuesday_song_free.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_d60676f51c7540e5ba8aef4780f877b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4232b19-2391-4cd2-9cda-9d000eb710b1/ms_project_training_course_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0f7654-4844-47dd-91dc-f9fe46d49496/33753723196.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/66505440772.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/half_yearly_exam_2018_date_sheet_rbse.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_17ab452ed0e54b3a92e13b645d25e864.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_b5eb2369160441e29cef4e6f303f4fa4.pdf?index=trueIn PDF document text
    • http://jinonepi.epizy.com/dajodaviwopepakagewet.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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5616 bytes
SHA-256: 1fc31128792d19c4cf7541bef9a57c2e81b1feeb9e5b0a30f5adb6dde55ece37
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10192 bytes
SHA-256: 11650c7f4deabbc0897727e13cd803295fd90176e0c3a50ac9df70df7d7dea57

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