Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1a6db9ed55db49…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 01:34:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 447d2f046504a1a1ef723d51ae817814 SHA-1: fdf8c4777eff381c0135a8e4181151159483ff47 SHA-256: ed1a6db9ed55db496d783c1f1efd5c9b3789d89ed4b0658baf31130a16fb47fe
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=can+limits+be+negative
    • http://zootime.store/srimad_bhagavatam_in_telugu_mp3_free_downloadq1j8c.pdf
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/7083074.pdf
    • https://cdn.sqhk.co/vapatibu/jfjiiiJ/city_photo_editor_city_photo_frame.pdf
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/dojugedo.pdf
    • https://cdn.sqhk.co/xupodafib/ijhzOjb/bowomuwaga.pdf
    • https://cdn.sqhk.co/daviluzabidi/gc6aie6/wimarujit.pdf
    • http://todayshop.website/wwe_champions_free_cash55xl5.pdf
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/1f098c9cf0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_98cfb554050f4c14b6e6d850d20c87c1.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_52fd707cde6f47fb89e3db0d827c8444.pdf?index=true
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_d0bfb0ce221d4d2baa85813073edf955.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_6c4d30a2f6624575be4241ba6767cbe7.pdf?index=true
    • https://s3.amazonaws.com/tometubufimopim/romeo_and_juliet_project_packet_answer_key.pdf
    • https://s3.amazonaws.com/megulu/14685642468.pdf
    • https://s3.amazonaws.com/vavapekadoliti/apprendre_l_anglais.pdf
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_30cf9c8bfbbe4bbebc117c547ad4f8d7.pdf?index=true
    • http://nimetegukixiz.rf.gd/jesuitas_alicante_uniforme.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef43.bin
69d6e3c1f7a87c95c8c41308ef8a7511d3acd50ba3f7508d3b21d0c4069ae165		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5016 bytes
font_01_sfnt_off00010049.bin
b49df939c3bf3c455f0fbb3aa949b3dfd7e28257727f2ec9aba0f151de060431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 11100 bytes

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