Malicious PDF — malware analysis report

Static analysis result for SHA-256 20156969ceb06fe4…

MALICIOUS

PDF

78.6 KB Created: 2021-03-10 09:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aad3b050bc00723b076e89eb76d1bf6e SHA-1: 4f5b99a467efc2126f2f2f2ff271f134059b748e SHA-256: 20156969ceb06fe4653c9693941717b18eab49bc28d966bf329139257b24a29b
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a phishing/trojan threat. It contains a significant number of external URLs, many pointing to disposable domains, suggesting an attempt to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://resalured.ru/strik?utm_term=2013+jeep+grand+cherokee+limited+for+sale+near+me
    • http://contarinihome.com/the_wifes_lament_sparknotessgq2h.pdf
    • http://inmyshtangen.xyz/5197815426gfve.pdf
    • https://cdn-cms.f-static.net/uploads/4422382/normal_600fc05538441.pdf
    • https://cdn-cms.f-static.net/uploads/4456399/normal_6046e14c28ff1.pdf
    • http://becloud.website/8509793533nyvuu.pdf
    • http://arfeshome.com/xoxokikoi47le.pdf
    • https://static.s123-cdn-static.com/uploads/4404502/normal_5fe30e7e25594.pdf
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fe467b8e3651.pdf
    • http://yandex-delivery.cc/watorupazakuzimigojiwajipqg2g.pdf
    • https://static.s123-cdn-static.com/uploads/4409256/normal_6006818e06a16.pdf
    • http://bewilotaweje.mywebcommunity.org/is_50_shades_darker_on_netflix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_b8728d24ebc14e15b4d545a95f6772ed.pdf?index=true
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_60f24a9d7dad48b1bb9ebe85ce71974a.pdf?index=true
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_a7baa25165e84218919e346d1a6d6bb9.pdf?index=true
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_00ee44eb0af4496bb26b767aea7d524b.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_de7879ee55644a29b37efc9292342efe.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_f1da38b3abc24807a3783c9b662ca285.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_2139f7107bae41f7a6b28b284b0a0b91.pdf?index=true
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_b54d19e395c64a11b4d49fdc0f2551ae.pdf?index=true
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_a7a9cf65d0ad466cbd84bca3d660575a.pdf?index=true
    • http://vujuvisesakok.myartsonline.com/sewowakemarusi.pdf
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_6dd4ef8e24fe4677a884b6178f1947c5.pdf?index=true
    • 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_off0000f3b2.bin
d55755426e6a8b088e8d936a64da8fe3ff52c78e143adf197c0a653d262b88b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 6104 bytes
font_01_sfnt_off0001085e.bin
ed143154e4d349e396a7f16273dd993ee664a3f2af97f013bb39e8c21094dac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 10708 bytes

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