Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f50b73148ea9139…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 01:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 67d94ee5cf219ca29d8c2f77956b2ff3 SHA-1: 1d68c662315aebb77b9da80b42ce4e891a593a71 SHA-256: 0f50b73148ea9139109496eb6e7ea31571709bd529df97148349100d6b5bbb36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=south+film++video+hd PDF link annotation
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/5184085.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/72728678620.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/gibogasava.pdfIn PDF document text
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/makul-zufenenesome-jojekoligixunag-tuzujudenetip.pdfIn PDF document text
    • https://ludutaxe.weebly.com/uploads/1/3/0/8/130814402/ruwuvul-datorosamivu-mamomaxegi-zodevudiwupa.pdfIn PDF document text
    • https://todukikezigegu.weebly.com/uploads/1/3/4/3/134359798/9244823.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/sennheiser_ew_100-eng_g3_wireless_microphone_set.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/tinezedu/kuwoxuviwowejofonisatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9377af74-ea6d-4c1b-9eac-1b1f390f2937/autocad_2020_free_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1aa34a-87a2-4134-929b-9ec84d4c64d1/why_wont_my_clock_hands_move.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c1c208-0143-4584-a9f0-25dc97c44b81/29332602532.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_0d12fef33d96497ca4fa4bb94bed2cde.pdf?index=trueIn PDF document text
    • http://voxinuxo.epizy.com/19414020150.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_95e563eee2f74f31a561d3ca5dc1511b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/ribawiku.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/dozipowulamutib.pdfIn PDF document text
    • http://zijipowatik.epizy.com/household_budget_templates_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d94d7d-9049-4bb2-a6dc-2ebf08025fd3/free_romantic_novels_in_english.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_ce29bfca375b4286b693e592058e54fd.pdf?index=trueIn PDF document text
    • http://jegapedobip.epizy.com/kivetezubitolanitenebor.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 4828 bytes
SHA-256: c6d59ee6bae8c08fae5c5c397ef1e74f563e9890cb67ba71c1c62cf9284bb266
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 10492 bytes
SHA-256: 4caeb72e2698c0e858efb714a32af372ed5282eefd312ca4f5786b61a9c566c2

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