Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2d6d28aacbf2e7…

MALICIOUS

PDF

68.4 KB Created: 2021-02-22 15:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ff4ef9c3667b36d1f7d632fcca303314 SHA-1: c064518380e93e0a705f0653de8b618e73f0d050 SHA-256: 2c2d6d28aacbf2e7dcdcb81a65e4cc74a8b1b037b411802e8832eb3b63cd041c
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely a spearphishing attachment, that directs users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=scope+and+sequence+phonological+awareness+phonics+and+spelling PDF link annotation
    • https://cdn.sqhk.co/woteruzid/gcih6IR/44868834019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_6026633a356c0.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/jirowabogororeb-jevejuduginiti-wuvuwowomurif.pdfIn PDF document text
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/3797764.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/ijfiigc/talking_angela_hacker_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ffc3a45e7210.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/eqhccbE/10722522005.pdfIn PDF document text
    • https://napuguzexavuzes.weebly.com/uploads/1/3/4/8/134875267/906f92.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/ichjtie/33641681365.pdfIn PDF document text
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/ee07cc5d395cc20.pdfIn PDF document text
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/4421800.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/3337172.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/kabisebax/range_high_school_formby_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/t_c_u_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/ley_de_condominios_en_venezuela_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/zelda_botw_captured_memories_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/another_in_the_fire_hillsong_sheet_music.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_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 5656 bytes
SHA-256: 55b7bf8ba458a20d452222b9d59b848e6d6daef3b9870bfd32e12f7d5c744452
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 10392 bytes
SHA-256: 9e263a91c208706f98ab852a422aa555db8a6ff7018561e1f4b49685be3145be

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